C++ cast to derived class

dynamic_cast should be what you are looking for.

EDIT:

DerivedType m_derivedType = m_baseType; // gives same error

The above appears to be trying to invoke the assignment operator, which is probably not defined on type DerivedType and accepting a type of BaseType.

DerivedType * m_derivedType = (DerivedType*) & m_baseType; // gives same error

You are on the right path here but the usage of the dynamic_cast will attempt to safely cast to the supplied type and if it fails, a NULL will be returned.

Going on memory here, try this (but note the cast will return NULL as you are casting from a base type to a derived type):

DerivedType * m_derivedType = dynamic_cast<DerivedType*>(&m_baseType);

If m_baseType was a pointer and actually pointed to a type of DerivedType, then the dynamic_cast should work.

Hope this helps!

How to choose the right bean scope?

Introduction

It represents the scope (the lifetime) of the bean. This is easier to understand if you are familiar with "under the covers" working of a basic servlet web application: How do servlets work? Instantiation, sessions, shared variables and multithreading.

`@Request/View/Flow/Session/ApplicationScoped`

A @RequestScoped bean lives as long as a single HTTP request-response cycle (note that an Ajax request counts as a single HTTP request too). A @ViewScoped bean lives as long as you're interacting with the same JSF view by postbacks which call action methods returning null/void without any navigation/redirect. A @FlowScoped bean lives as long as you're navigating through the specified collection of views registered in the flow configuration file. A @SessionScoped bean lives as long as the established HTTP session. An @ApplicationScoped bean lives as long as the web application runs. Note that the CDI @Model is basically a stereotype for @Named @RequestScoped, so same rules apply.

Which scope to choose depends solely on the data (the state) the bean holds and represents. Use @RequestScoped for simple and non-ajax forms/presentations. Use @ViewScoped for rich ajax-enabled dynamic views (ajaxbased validation, rendering, dialogs, etc). Use @FlowScoped for the "wizard" ("questionnaire") pattern of collecting input data spread over multiple pages. Use @SessionScoped for client specific data, such as the logged-in user and user preferences (language, etc). Use @ApplicationScoped for application wide data/constants, such as dropdown lists which are the same for everyone, or managed beans without any instance variables and having only methods.

Abusing an @ApplicationScoped bean for session/view/request scoped data would make it to be shared among all users, so anyone else can see each other's data which is just plain wrong. Abusing a @SessionScoped bean for view/request scoped data would make it to be shared among all tabs/windows in a single browser session, so the enduser may experience inconsitenties when interacting with every view after switching between tabs which is bad for user experience. Abusing a @RequestScoped bean for view scoped data would make view scoped data to be reinitialized to default on every single (ajax) postback, causing possibly non-working forms (see also points 4 and 5 here). Abusing a @ViewScoped bean for request, session or application scoped data, and abusing a @SessionScoped bean for application scoped data doesn't affect the client, but it unnecessarily occupies server memory and is plain inefficient.

Note that the scope should rather not be chosen based on performance implications, unless you really have a low memory footprint and want to go completely stateless; you'd need to use exclusively @RequestScoped beans and fiddle with request parameters to maintain the client's state. Also note that when you have a single JSF page with differently scoped data, then it's perfectly valid to put them in separate backing beans in a scope matching the data's scope. The beans can just access each other via @ManagedProperty in case of JSF managed beans or @Inject in case of CDI managed beans.

`@CustomScoped/NoneScoped/Dependent`

It's not mentioned in your question, but (legacy) JSF also supports @CustomScoped and @NoneScoped, which are rarely used in real world. The @CustomScoped must refer a custom Map<K, Bean> implementation in some broader scope which has overridden Map#put() and/or Map#get() in order to have more fine grained control over bean creation and/or destroy.

The JSF @NoneScoped and CDI @Dependent basically lives as long as a single EL-evaluation on the bean. Imagine a login form with two input fields referring a bean property and a command button referring a bean action, thus with in total three EL expressions, then effectively three instances will be created. One with the username set, one with the password set and one on which the action is invoked. You normally want to use this scope only on beans which should live as long as the bean where it's being injected. So if a @NoneScoped or @Dependent is injected in a @SessionScoped, then it will live as long as the @SessionScoped bean.

Flash scope

As last, JSF also supports the flash scope. It is backed by a short living cookie which is associated with a data entry in the session scope. Before the redirect, a cookie will be set on the HTTP response with a value which is uniquely associated with the data entry in the session scope. After the redirect, the presence of the flash scope cookie will be checked and the data entry associated with the cookie will be removed from the session scope and be put in the request scope of the redirected request. Finally the cookie will be removed from the HTTP response. This way the redirected request has access to request scoped data which was been prepared in the initial request.

This is actually not available as a managed bean scope, i.e. there's no such thing as @FlashScoped. The flash scope is only available as a map via ExternalContext#getFlash() in managed beans and #{flash} in EL.

Dynamically add script tag with src that may include document.write

There is the onload function, that could be called when the script has loaded successfully:

function addScript( src, callback ) {
  var s = document.createElement( 'script' );
  s.setAttribute( 'src', src );
  s.onload=callback;
  document.body.appendChild( s );
}

How to open the default webbrowser using java

on windows invoke "cmd /k start http://www.example.com" Infact you can always invoke "default" programs using the start command. For ex start abc.mp3 will invoke the default mp3 player and load the requested mp3 file.

Keras input explanation: input_shape, units, batch_size, dim, etc

Units:

The amount of "neurons", or "cells", or whatever the layer has inside it.

It's a property of each layer, and yes, it's related to the output shape (as we will see later). In your picture, except for the input layer, which is conceptually different from other layers, you have:

Hidden layer 1: 4 units (4 neurons)
Hidden layer 2: 4 units
Last layer: 1 unit

Shapes

Shapes are consequences of the model's configuration. Shapes are tuples representing how many elements an array or tensor has in each dimension.

Ex: a shape (30,4,10) means an array or tensor with 3 dimensions, containing 30 elements in the first dimension, 4 in the second and 10 in the third, totaling 30*4*10 = 1200 elements or numbers.

The input shape

What flows between layers are tensors. Tensors can be seen as matrices, with shapes.

In Keras, the input layer itself is not a layer, but a tensor. It's the starting tensor you send to the first hidden layer. This tensor must have the same shape as your training data.

Example: if you have 30 images of 50x50 pixels in RGB (3 channels), the shape of your input data is (30,50,50,3). Then your input layer tensor, must have this shape (see details in the "shapes in keras" section).

Each type of layer requires the input with a certain number of dimensions:

Dense layers require inputs as (batch_size, input_size)
- or (batch_size, optional,...,optional, input_size)
2D convolutional layers need inputs as:
- if using channels_last: (batch_size, imageside1, imageside2, channels)
- if using channels_first: (batch_size, channels, imageside1, imageside2)
1D convolutions and recurrent layers use (batch_size, sequence_length, features)
- Details on how to prepare data for recurrent layers

Now, the input shape is the only one you must define, because your model cannot know it. Only you know that, based on your training data.

All the other shapes are calculated automatically based on the units and particularities of each layer.

Relation between shapes and units - The output shape

Given the input shape, all other shapes are results of layers calculations.

The "units" of each layer will define the output shape (the shape of the tensor that is produced by the layer and that will be the input of the next layer).

Each type of layer works in a particular way. Dense layers have output shape based on "units", convolutional layers have output shape based on "filters". But it's always based on some layer property. (See the documentation for what each layer outputs)

Let's show what happens with "Dense" layers, which is the type shown in your graph.

A dense layer has an output shape of (batch_size,units). So, yes, units, the property of the layer, also defines the output shape.

Hidden layer 1: 4 units, output shape: (batch_size,4).
Hidden layer 2: 4 units, output shape: (batch_size,4).
Last layer: 1 unit, output shape: (batch_size,1).

Weights

Weights will be entirely automatically calculated based on the input and the output shapes. Again, each type of layer works in a certain way. But the weights will be a matrix capable of transforming the input shape into the output shape by some mathematical operation.

In a dense layer, weights multiply all inputs. It's a matrix with one column per input and one row per unit, but this is often not important for basic works.

In the image, if each arrow had a multiplication number on it, all numbers together would form the weight matrix.

Shapes in Keras

Earlier, I gave an example of 30 images, 50x50 pixels and 3 channels, having an input shape of (30,50,50,3).

Since the input shape is the only one you need to define, Keras will demand it in the first layer.

But in this definition, Keras ignores the first dimension, which is the batch size. Your model should be able to deal with any batch size, so you define only the other dimensions:

input_shape = (50,50,3)
    #regardless of how many images I have, each image has this shape

Optionally, or when it's required by certain kinds of models, you can pass the shape containing the batch size via batch_input_shape=(30,50,50,3) or batch_shape=(30,50,50,3). This limits your training possibilities to this unique batch size, so it should be used only when really required.

Either way you choose, tensors in the model will have the batch dimension.

So, even if you used input_shape=(50,50,3), when keras sends you messages, or when you print the model summary, it will show (None,50,50,3).

The first dimension is the batch size, it's None because it can vary depending on how many examples you give for training. (If you defined the batch size explicitly, then the number you defined will appear instead of None)

Also, in advanced works, when you actually operate directly on the tensors (inside Lambda layers or in the loss function, for instance), the batch size dimension will be there.

So, when defining the input shape, you ignore the batch size: input_shape=(50,50,3)
When doing operations directly on tensors, the shape will be again (30,50,50,3)
When keras sends you a message, the shape will be (None,50,50,3) or (30,50,50,3), depending on what type of message it sends you.

Dim

And in the end, what is dim?

If your input shape has only one dimension, you don't need to give it as a tuple, you give input_dim as a scalar number.

So, in your model, where your input layer has 3 elements, you can use any of these two:

input_shape=(3,) -- The comma is necessary when you have only one dimension
input_dim = 3

But when dealing directly with the tensors, often dim will refer to how many dimensions a tensor has. For instance a tensor with shape (25,10909) has 2 dimensions.

Defining your image in Keras

Keras has two ways of doing it, Sequential models, or the functional API Model. I don't like using the sequential model, later you will have to forget it anyway because you will want models with branches.

PS: here I ignored other aspects, such as activation functions.

With the Sequential model:

from keras.models import Sequential  
from keras.layers import *  

model = Sequential()    

#start from the first hidden layer, since the input is not actually a layer   
#but inform the shape of the input, with 3 elements.    
model.add(Dense(units=4,input_shape=(3,))) #hidden layer 1 with input

#further layers:    
model.add(Dense(units=4)) #hidden layer 2
model.add(Dense(units=1)) #output layer

With the functional API Model:

from keras.models import Model   
from keras.layers import * 

#Start defining the input tensor:
inpTensor = Input((3,))   

#create the layers and pass them the input tensor to get the output tensor:    
hidden1Out = Dense(units=4)(inpTensor)    
hidden2Out = Dense(units=4)(hidden1Out)    
finalOut = Dense(units=1)(hidden2Out)   

#define the model's start and end points    
model = Model(inpTensor,finalOut)

Shapes of the tensors

Remember you ignore batch sizes when defining layers:

inpTensor: (None,3)
hidden1Out: (None,4)
hidden2Out: (None,4)
finalOut: (None,1)

any tool for java object to object mapping?

Use Apache commons beanutils:

static void copyProperties(Object dest, Object orig) -Copy property values from the origin bean to the destination bean for all cases where the property names are the same.

http://commons.apache.org/proper/commons-beanutils/

Rendering an array.map() in React

import React, { Component } from 'react';

class Result extends Component {


    render() {

           if(this.props.resultsfood.status=='found'){

            var foodlist = this.props.resultsfood.items.map(name=>{

                   return (


                   <div className="row" key={name.id} >

                  <div className="list-group">   

                  <a href="#" className="list-group-item list-group-item-action disabled">

                  <span className="badge badge-info"><h6> {name.item}</h6></span>
                  <span className="badge badge-danger"><h6> Rs.{name.price}/=</h6></span>

                  </a>
                  <a href="#" className="list-group-item list-group-item-action disabled">
                  <div className="alert alert-dismissible alert-secondary">

                    <strong>{name.description}</strong>  
                    </div>
                  </a>
                <div className="form-group">

                    <label className="col-form-label col-form-label-sm" htmlFor="inputSmall">Quantitiy</label>
                    <input className="form-control form-control-sm" placeholder="unit/kg"  type="text" ref="qty"/>
                    <div> <button type="button" className="btn btn-success"  
                    onClick={()=>{this.props.savelist(name.item,name.price);
                    this.props.pricelist(name.price);
                    this.props.quntylist(this.refs.qty.value);
                    }
                    }>ADD Cart</button>
                        </div>



                  <br/>

                      </div>

                </div>

                </div>

                   )
            })



           }



        return (
<ul>
   {foodlist}
</ul>
        )
    }
}

export default Result;

how to set auto increment column with sql developer

You can make auto increment in SQL Modeler. In column properties window Click : General then Tick the box of Auto Increment. After that the auto increment window will be enabled for you.

What's the best practice for primary keys in tables?

I'll be up-front about my preference for natural keys - use them where possible, as they'll make your life of database administration a lot easier. I established a standard in our company that all tables have the following columns:

Row ID (GUID)
Creator (string; has a default of the current user's name (SUSER_SNAME() in T-SQL))
Created (DateTime)
Timestamp

Row ID has a unique key on it per table, and in any case is auto-generated per row (and permissions prevent anyone editing it), and is reasonably guaranteed to be unique across all tables and databases. If any ORM systems need a single ID key, this is the one to use.

Meanwhile, the actual PK is, if possible, a natural key. My internal rules are something like:

People - use surrogate key, e.g. INT. If it's internal, the Active Directory user GUID is an acceptable choice
Lookup tables (e.g. StatusCodes) - use a short CHAR code; it's easier to remember than INTs, and in many cases the paper forms and users will also use it for brevity (e.g. Status = "E" for "Expired", "A" for "Approved", "NADIS" for "No Asbestos Detected In Sample")
Linking tables - combination of FKs (e.g. EventId, AttendeeId)

So ideally you end up with a natural, human-readable and memorable PK, and an ORM-friendly one-ID-per-table GUID.

Caveat: the databases I maintain tend to the 100,000s of records rather than millions or billions, so if you have experience of larger systems which contraindicates my advice, feel free to ignore me!

CSS endless rotation animation

Works in all modern browsers

.rotate{
 animation: loading 3s linear infinite;
 @keyframes loading {
  0% { 
    transform: rotate(0); 
  }
  100% { 
    transform: rotate(360deg);
  }
 }
}

How do you add an ActionListener onto a JButton in Java

Your best bet is to review the Java Swing tutorials, specifically the tutorial on Buttons.

The short code snippet is:

jBtnDrawCircle.addActionListener( /*class that implements ActionListener*/ );

@HostBinding and @HostListener: what do they do and what are they for?

DECORATORS: to dynamically change the behaviour of DOM elements

@HostBinding: Dynamic binding custom logic to Host element

 @HostBinding('class.active')
 activeClass = false;

@HostListen: To Listen to events on Host element

@HostListener('click')
 activeFunction(){
    this.activeClass = !this.activeClass;
 }

Host Element:

  <button type='button' class="btn btn-primary btn-sm" appHost>Host</button>

How to refresh materialized view in oracle

Best option is to use the '?' argument for the method. This way DBMS_MVIEW will choose the best way to refresh, so it'll do the fastest refresh it can for you. , and won't fail if you try something like method=>'f' when you actually need a complete refresh. :-)

from the SQL*Plus prompt:

EXEC DBMS_MVIEW.REFRESH('my_schema.my_mview', method => '?');

"SetPropertiesRule" warning message when starting Tomcat from Eclipse

I'm finding that Tomcat can't seem to find classes defined in other projects, maybe even in the main project. It's failing on the filter definition which is the first definition in web.xml. If I add the project and its dependencies to the server's launch configuration then I just move on to a new error, all of which seems to point to it not setting up the project properly.

Our setup is quite complex. We have multiple components as projects in Eclipse with separate output projects. We have a separate webapp directory which contains the static HTML and images, as well as our WEB-INF.

Eclipse is "Europa Winter release". Tomcat is 6.0.18. I tried version 2.4 and 2.5 of the "Dynamic Web Module" facet.

Thanks for any help!

Richard

Declare a Range relative to the Active Cell with VBA

Like this:

Dim rng as Range
Set rng = ActiveCell.Resize(numRows, numCols)

then read the contents of that range to an array:

Dim arr As Variant
arr = rng.Value
'arr is now a two-dimensional array of size (numRows, numCols)

or, select the range (I don't think that's what you really want, but you ask for this in the question).

rng.Select

How to dispatch a Redux action with a timeout?

It is simple. Use trim-redux package and write like this in componentDidMount or other place and kill it in componentWillUnmount.

componentDidMount() {
  this.tm = setTimeout(function() {
    setStore({ age: 20 });
  }, 3000);
}

componentWillUnmount() {
  clearTimeout(this.tm);
}

Mean of a column in a data frame, given the column's name

if your column contain any value that you want to neglect. it will help you

## da is data frame & Ozone is column name 

##for single column
mean(da$Ozone, na.rm = TRUE)  

##for all columns
colMeans(x=da, na.rm = TRUE)

C++ equivalent of java's instanceof

Try using:

if(NewType* v = dynamic_cast<NewType*>(old)) {
   // old was safely casted to NewType
   v->doSomething();
}

This requires your compiler to have rtti support enabled.

EDIT: I've had some good comments on this answer!

Every time you need to use a dynamic_cast (or instanceof) you'd better ask yourself whether it's a necessary thing. It's generally a sign of poor design.

Typical workarounds is putting the special behaviour for the class you are checking for into a virtual function on the base class or perhaps introducing something like a visitor where you can introduce specific behaviour for subclasses without changing the interface (except for adding the visitor acceptance interface of course).

As pointed out dynamic_cast doesn't come for free. A simple and consistently performing hack that handles most (but not all cases) is basically adding an enum representing all the possible types your class can have and check whether you got the right one.

if(old->getType() == BOX) {
   Box* box = static_cast<Box*>(old);
   // Do something box specific
}

This is not good oo design, but it can be a workaround and its cost is more or less only a virtual function call. It also works regardless of RTTI is enabled or not.

Note that this approach doesn't support multiple levels of inheritance so if you're not careful you might end with code looking like this:

// Here we have a SpecialBox class that inherits Box, since it has its own type
// we must check for both BOX or SPECIAL_BOX
if(old->getType() == BOX || old->getType() == SPECIAL_BOX) {
   Box* box = static_cast<Box*>(old);
   // Do something box specific
}

What are metaclasses in Python?

In object-oriented programming, a metaclass is a class whose instances are classes. Just as an ordinary class defines the behavior of certain objects, a metaclass defines the behavior of certain class and their instances The term metaclass simply means something used to create classes. In other words, it is the class of a class. The metaclass is used to create the class so like the object being an instance of a class, a class is an instance of a metaclass. In python classes are also considered objects.

How can I create a carriage return in my C# string

<br /> works for me

So...

String body = String.Format(@"New user: 
 <br /> Name: {0}
 <br /> Email: {1}
 <br /> Phone: {2}", Name, Email, Phone);

Produces...

New user:
Name: Name
Email: Email
Phone: Phone

Select all text inside EditText when it gets focus

Why don't you try android:hint="hint" to provide the hint to the user..!!

The "hint" will automatically disappear when the user clicks on the edittextbox. its the proper and best solution.

Find intersection of two nested lists?

To define intersection that correctly takes into account the cardinality of the elements use Counter:

from collections import Counter

>>> c1 = [1, 2, 2, 3, 4, 4, 4]
>>> c2 = [1, 2, 4, 4, 4, 4, 5]
>>> list((Counter(c1) & Counter(c2)).elements())
[1, 2, 4, 4, 4]

How to delete a line from a text file in C#?

I agree with John Saunders, this isn't really C# specific. However, to answer your question: you basically need to rewrite the file. There are two ways you can do this.

Read the whole file into memory (e.g. with File.ReadAllLines)
Remove the offending line (in this case it's probably easiest to convert the string array into a List<string> then remove the line)
Write all the rest of the lines back (e.g. with File.WriteAllLines) - potentially convert the List<string> into a string array again using ToArray

That means you have to know that you've got enough memory though. An alternative:

Open both the input file and a new output file (as a TextReader/TextWriter, e.g. with File.OpenText and File.CreateText)
Read a line (TextReader.ReadLine) - if you don't want to delete it, write it to the output file (TextWriter.WriteLine)
When you've read all the lines, close both the reader and the writer (if you use using statements for both, this will happen automatically)
If you want to replace the input with the output, delete the input file and then move the output file into place.

How can I make Bootstrap columns all the same height?

You can wrap the columns inside a div

<div class="row">
<div class="col-md-12>
  <div class="col-xs-12 col-sm-4 panel" style="background-color: red">
  some content
  </div>
  <div class="col-xs-6 col-sm-4 panel" style="background-color: yellow">
  kittenz
  <img src="http://placekitten.com/100/100">
  </div>
  <div class="col-xs-6 col-sm-4 panel" style="background-color: blue">
  some more content
  </div>
</div>
</div>

Simulation of CONNECT BY PRIOR of Oracle in SQL Server

@Alex Martelli's answer is great! But it work only for one element at time (WHERE name = 'Joan') If you take out the WHERE clause, the query will return all the root rows together...

I changed a little bit for my situation, so it can show the entire tree for a table.

table definition:

CREATE TABLE [dbo].[mar_categories] ( 
    [category]  int IDENTITY(1,1) NOT NULL,
    [name]      varchar(50) NOT NULL,
    [level]     int NOT NULL,
    [action]    int NOT NULL,
    [parent]    int NULL,
    CONSTRAINT [XPK_mar_categories] PRIMARY KEY([category])
)

(level is literally the level of a category 0: root, 1: first level after root, ...)

and the query:

WITH n(category, name, level, parent, concatenador) AS 
(
    SELECT category, name, level, parent, '('+CONVERT(VARCHAR (MAX), category)+' - '+CONVERT(VARCHAR (MAX), level)+')' as concatenador
    FROM mar_categories
    WHERE parent is null
        UNION ALL
    SELECT m.category, m.name, m.level, m.parent, n.concatenador+' * ('+CONVERT (VARCHAR (MAX), case when ISNULL(m.parent, 0) = 0 then 0 else m.category END)+' - '+CONVERT(VARCHAR (MAX), m.level)+')' as concatenador
    FROM mar_categories as m, n
    WHERE n.category = m.parent
)
SELECT distinct * FROM n ORDER BY concatenador asc

(You don't need to concatenate the level field, I did just to make more readable)

the answer for this query should be something like:

sql return

I hope it helps someone!

now, I'm wondering how to do this on MySQL... ^^

What is the boundary in multipart/form-data?

The exact answer to the question is: yes, you can use an arbitrary value for the boundary parameter, given it does not exceed 70 bytes in length and consists only of 7-bit US-ASCII (printable) characters.

If you are using one of multipart/* content types, you are actually required to specify the boundary parameter in the Content-Type header, otherwise the server (in the case of an HTTP request) will not be able to parse the payload.

You probably also want to set the charset parameter to UTF-8 in your Content-Type header, unless you can be absolutely sure that only US-ASCII charset will be used in the payload data.

A few relevant excerpts from the RFC2046:

4.1.2. Charset Parameter:

Unlike some other parameter values, the values of the charset parameter are NOT case sensitive. The default character set, which must be assumed in the absence of a charset parameter, is US-ASCII.
5.1. Multipart Media Type

As stated in the definition of the Content-Transfer-Encoding field [RFC 2045], no encoding other than "7bit", "8bit", or "binary" is permitted for entities of type "multipart". The "multipart" boundary delimiters and header fields are always represented as 7bit US-ASCII in any case (though the header fields may encode non-US-ASCII header text as per RFC 2047) and data within the body parts can be encoded on a part-by-part basis, with Content-Transfer-Encoding fields for each appropriate body part.

The Content-Type field for multipart entities requires one parameter, "boundary". The boundary delimiter line is then defined as a line consisting entirely of two hyphen characters ("-", decimal value 45) followed by the boundary parameter value from the Content-Type header field, optional linear whitespace, and a terminating CRLF.

Boundary delimiters must not appear within the encapsulated material, and must be no longer than 70 characters, not counting the two leading hyphens.

The boundary delimiter line following the last body part is a distinguished delimiter that indicates that no further body parts will follow. Such a delimiter line is identical to the previous delimiter lines, with the addition of two more hyphens after the boundary parameter value.

Here is an example using an arbitrary boundary:

Content-Type: multipart/form-data; charset=utf-8; boundary="another cool boundary"

--another cool boundary
Content-Disposition: form-data; name="foo"

bar
--another cool boundary
Content-Disposition: form-data; name="baz"

quux
--another cool boundary--

What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?

Putting this in since it's 'yet another' approach, seems to be different from others already given.

returns -1 if x==0, otherwise floor( log2(x)) (max result 31)

Reduce from 32 to 4 bit problem, then use a table. Perhaps inelegant, but pragmatic.

This is what I use when I don't want to use __builtin_clz because of portability issues.

To make it more compact, one could instead use a loop to reduce, adding 4 to r each time, max 7 iterations. Or some hybrid, such as (for 64 bits): loop to reduce to 8, test to reduce to 4.

int log2floor( unsigned x ){
   static const signed char wtab[16] = {-1,0,1,1, 2,2,2,2, 3,3,3,3,3,3,3,3};
   int r = 0;
   unsigned xk = x >> 16;
   if( xk != 0 ){
       r = 16;
       x = xk;
   }
   // x is 0 .. 0xFFFF
   xk = x >> 8;
   if( xk != 0){
       r += 8;
       x = xk;
   }
   // x is 0 .. 0xFF
   xk = x >> 4;
   if( xk != 0){
       r += 4;
       x = xk;
   }
   // now x is 0..15; x=0 only if originally zero.
   return r + wtab[x];
}

The best way to remove duplicate values from NSMutableArray in Objective-C?

Yes, using NSSet is a sensible approach.

To add to Jim Puls' answer, here's an alternative approach to stripping duplicates while retaining order:

// Initialise a new, empty mutable array 
NSMutableArray *unique = [NSMutableArray array];

for (id obj in originalArray) {
    if (![unique containsObject:obj]) {
        [unique addObject:obj];
    }
}

It's essentially the same approach as Jim's but copies unique items to a fresh mutable array rather than deleting duplicates from the original. This makes it slightly more memory efficient in the case of a large array with lots of duplicates (no need to make a copy of the entire array), and is in my opinion a little more readable.

Note that in either case, checking to see if an item is already included in the target array (using containsObject: in my example, or indexOfObject:inRange: in Jim's) doesn't scale well for large arrays. Those checks run in O(N) time, meaning that if you double the size of the original array then each check will take twice as long to run. Since you're doing the check for each object in the array, you'll also be running more of those more expensive checks. The overall algorithm (both mine and Jim's) runs in O(N²) time, which gets expensive quickly as the original array grows.

To get that down to O(N) time you could use a NSMutableSet to store a record of items already added to the new array, since NSSet lookups are O(1) rather than O(N). In other words, checking to see whether an element is a member of an NSSet takes the same time regardless of how many elements are in the set.

Code using this approach would look something like this:

NSMutableArray *unique = [NSMutableArray array];
NSMutableSet *seen = [NSMutableSet set];

for (id obj in originalArray) {
    if (![seen containsObject:obj]) {
        [unique addObject:obj];
        [seen addObject:obj];
    }
}

This still seems a little wasteful though; we're still generating a new array when the question made clear that the original array is mutable, so we should be able to de-dupe it in place and save some memory. Something like this:

NSMutableSet *seen = [NSMutableSet set];
NSUInteger i = 0;

while (i < [originalArray count]) {
    id obj = [originalArray objectAtIndex:i];

    if ([seen containsObject:obj]) {
        [originalArray removeObjectAtIndex:i];
        // NB: we *don't* increment i here; since
        // we've removed the object previously at
        // index i, [originalArray objectAtIndex:i]
        // now points to the next object in the array.
    } else {
        [seen addObject:obj];
        i++;
    }
}

UPDATE: Yuri Niyazov pointed out that my last answer actually runs in O(N²) because removeObjectAtIndex: probably runs in O(N) time.

(He says "probably" because we don't know for sure how it's implemented; but one possible implementation is that after deleting the object at index X the method then loops through every element from index X+1 to the last object in the array, moving them to the previous index. If that's the case then that is indeed O(N) performance.)

So, what to do? It depends on the situation. If you've got a large array and you're only expecting a small number of duplicates then the in-place de-duplication will work just fine and save you having to build up a duplicate array. If you've got an array where you're expecting lots of duplicates then building up a separate, de-duped array is probably the best approach. The take-away here is that big-O notation only describes the characteristics of an algorithm, it won't tell you definitively which is best for any given circumstance.

Send SMTP email using System.Net.Mail via Exchange Online (Office 365)

Quick answer: the FROM address must exactly match the account you are sending from, or you will get a error 5.7.1 Client does not have permissions to send as this sender.

My guess is that prevents email spoofing with your Office 365 account, otherwise you might be able to send as [email protected].

Another thing to try is in the authentication, fill in the third field with the domain, like

Dim smtpAuth = New System.Net.NetworkCredential(
    "TheDude", "hunter2password", "MicrosoftOffice365Domain.com")

If that doesn't work, double check that you can log into the account at: https://portal.microsoftonline.com

Yet another thing to note is your Antivirus solution may be blocking programmatic access to ports 25 and 587 as a anti-spamming solution. Norton and McAfee may silently block access to these ports. Only enabling Mail and Socket debugging will allow you to notice it (see below).

One last thing to note, the Send method is Asynchronous. If you call

Dispose

immediately after you call send, your are more than likely closing your connection before the mail is sent. Have your smtpClient instance listen for the OnSendCompleted event, and call dispose from there. You must use SendAsync method instead, the Send method does not raise this event.

Detailed Answer: With Visual Studio (VB.NET or C# doesn't matter), I made a simple form with a button that created the Mail Message, similar to that above. Then I added this to the application.exe.config (in the bin/debug directory of my project). This enables the Output tab to have detailed debug info.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <system.diagnostics>
        <sources>
            <source name="System.Net">
                <listeners>
                    <add name="System.Net" />
                </listeners>
            </source>
            <source name="System.Net.Sockets">
                <listeners>
                    <add name="System.Net" />
                </listeners>
            </source>
        </sources>
        <switches>
            <add name="System.Net" value="Verbose" />
            <add name="System.Net.Sockets" value="Verbose" />
        </switches>
        <sharedListeners>
            <add name="System.Net"
              type="System.Diagnostics.TextWriterTraceListener"
              initializeData="System.Net.log"
            />
        </sharedListeners>
        <trace autoflush="true" />
    </system.diagnostics>
</configuration>

Calling C++ class methods via a function pointer

Reason why you cannot use function pointers to call member functions is that ordinary function pointers are usually just the memory address of the function.

To call a member function, you need to know two things:

Which member function to call
Which instance should be used (whose member function)

Ordinary function pointers cannot store both. C++ member function pointers are used to store a), which is why you need to specify the instance explicitly when calling a member function pointer.

Child element click event trigger the parent click event

Click event Bubbles, now what is meant by bubbling, a good point to starts is here. you can use event.stopPropagation(), if you don't want that event should propagate further.

Also a good link to refer on MDN

getElementById in React

You need to have your function in the componentDidMount lifecycle since this is the function that is called when the DOM has loaded.

Make use of refs to access the DOM element

<input type="submit" className="nameInput" id="name" value="cp-dev1" onClick={this.writeData} ref = "cpDev1"/>

  componentDidMount: function(){
    var name = React.findDOMNode(this.refs.cpDev1).value;
    this.someOtherFunction(name);
  }

See this answer for more info on How to access the dom element in React

How to import a bak file into SQL Server Express

There is a step by step explanation (with pictures) available @ Restore DataBase

Click Start, select All Programs, click Microsoft SQL Server 2008 and select SQL Server Management Studio.
This will bring up the Connect to Server dialog box.
Ensure that the Server name YourServerName and that Authentication is set to Windows Authentication.
Click Connect.
On the right, right-click Databases and select Restore Database.
This will bring up the Restore Database window.
On the Restore Database screen, select the From Device radio button and click the "..." box.
This will bring up the Specify Backup screen.
On the Specify Backup screen, click Add.
This will bring up the Locate Backup File.
Select the DBBackup folder and chose your BackUp File(s).
On the Restore Database screen, under Select the backup sets to restore: place a check in the Restore box, next to your data and in the drop-down next to To database: select DbName.
You're done.

Getting the location from an IP address

A pure Javascript example, using the services of https://geolocation-db.com They provide a JSON and JSONP-callback solution.

JSON: https://geolocation-db.com/json
JSONP-callback: https://geolocation-db.com/jsonp

No jQuery required!

<!DOCTYPE html>
<html>
<head>
<title>Geo City Locator by geolocation-db.com</title>
</head>
<body>
    <div>Country: <span id="country"></span></div>
    <div>State: <span id="state"></span></div>
    <div>City: <span id="city"></span></div>
    <div>Postal: <span id="postal"></span></div>
    <div>Latitude: <span id="latitude"></span></div>
    <div>Longitude: <span id="longitude"></span></div>
    <div>IP address: <span id="ipv4"></span></div>                             
</body>
<script>

    var country = document.getElementById('country');
    var state = document.getElementById('state');
    var city = document.getElementById('city');
    var postal = document.getElementById('postal');
    var latitude = document.getElementById('latitude');
    var longitude = document.getElementById('longitude');
    var ip = document.getElementById('ipv4');

    function callback(data)
    {
        country.innerHTML = data.country_name;
        state.innerHTML = data.state;
        city.innerHTML = data.city;
        postal.innerHTML = data.postal;
        latitude.innerHTML = data.latitude;
        longitude.innerHTML = data.longitude;
        ip.innerHTML = data.IPv4;
    }

    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = 'https://geoilocation-db.com/json/geoip.php?jsonp=callback';
    var h = document.getElementsByTagName('script')[0];
    h.parentNode.insertBefore(script, h);

</script> 
</html>

add allow_url_fopen to my php.ini using .htaccess

Try this, but I don't think it will work because you're not supposed to be able to change this

Put this line in an htaccess file in the directory you want the setting to be enabled:

php_value allow_url_fopen On

Note that this setting will only apply to PHP file's in the same directory as the htaccess file.

As an alternative to using url_fopen, try using curl.

Stored procedure - return identity as output parameter or scalar

I prefer to return the identity value as an output parameter. The result of the SP should indicate whether it succeeded or not. A value of 0 indicates the SP successfully completed, a non-zero value indicates an error. Also, if you ever need to make a change and return an additional value from the SP you don't need to make any changes other than adding an additional output parameter.

Does a TCP socket connection have a "keep alive"?

For Windows according to Microsoft docs

KeepAliveTime (REG_DWORD, milliseconds, by default is not set which means 7,200,000,000 = 2 hours) - analogue to tcp_keepalive_time
KeepAliveInterval (REG_DWORD, milliseconds, by default is not set which means 1,000 = 1 second) - analogue to tcp_keepalive_intvl
Since Windows Vista there is no analogue to tcp_keepalive_probes, value is fixed to 10 and cannot be changed

How to return a result from a VBA function

VBA functions treat the function name itself as a sort of variable. So instead of using a "return" statement, you would just say:

test = 1

Notice, though, that this does not break out of the function. Any code after this statement will also be executed. Thus, you can have many assignment statements that assign different values to test, and whatever the value is when you reach the end of the function will be the value returned.

Use .htaccess to redirect HTTP to HTTPs

None if this worked for me. First of all I had to look at my provider to see how they activate SSL in .htaccess my provider gives

<IfModule mod_rewrite.c>
   RewriteEngine On
   RewriteCond %{HTTP:HTTPS} !on
   RewriteRule (.*) https://%{SERVER_NAME}/$1 [QSA,L,R=301]
</IfModule>

But what took me days of research is I had to add to wp-config.php the following lines as my provided site is behind a proxy :

/**
 * Force le SSL
 */
define('FORCE_SSL_ADMIN', true);
if (strpos($_SERVER['HTTP_X_FORWARDED_PROTO'], 'https') !== false) $_SERVER['HTTPS']='on';

postgresql return 0 if returned value is null

(this answer was added to provide shorter and more generic examples to the question - without including all the case-specific details in the original question).

There are two distinct "problems" here, the first is if a table or subquery has no rows, the second is if there are NULL values in the query.

For all versions I've tested, postgres and mysql will ignore all NULL values when averaging, and it will return NULL if there is nothing to average over. This generally makes sense, as NULL is to be considered "unknown". If you want to override this you can use coalesce (as suggested by Luc M).

$ create table foo (bar int);
CREATE TABLE

$ select avg(bar) from foo;
 avg 
-----

(1 row)

$ select coalesce(avg(bar), 0) from foo;
 coalesce 
----------
        0
(1 row)

$ insert into foo values (3);
INSERT 0 1
$ insert into foo values (9);
INSERT 0 1
$ insert into foo values (NULL);
INSERT 0 1
$ select coalesce(avg(bar), 0) from foo;
      coalesce      
--------------------
 6.0000000000000000
(1 row)

of course, "from foo" can be replaced by "from (... any complicated logic here ...) as foo"

Now, should the NULL row in the table be counted as 0? Then coalesce has to be used inside the avg call.

$ select coalesce(avg(coalesce(bar, 0)), 0) from foo;
      coalesce      
--------------------
 4.0000000000000000
(1 row)

converting a base 64 string to an image and saving it

In a similar scenario what worked for me was the following:

byte[] bytes = Convert.FromBase64String(Base64String);    
ImageTagId.ImageUrl = "data:image/jpeg;base64," + Convert.ToBase64String(bytes);

ImageTagId is the ID of the ASP image tag.

Display date/time in user's locale format and time offset

You can use new Date().getTimezoneOffset()/60 for the timezone. There is also a toLocaleString() method for displaying a date using the user's locale.

Here's the whole list: Working with Dates

Find the unique values in a column and then sort them

sort sorts inplace so returns nothing:

In [54]:
df = pd.DataFrame({'A':[1,1,3,2,6,2,8]})
a = df['A'].unique()
a.sort()
a

Out[54]:
array([1, 2, 3, 6, 8], dtype=int64)

So you have to call print a again after the call to sort.

Eg.:

In [55]:
df = pd.DataFrame({'A':[1,1,3,2,6,2,8]})
a = df['A'].unique()
a.sort()
print(a)

[1 2 3 6 8]

Git checkout - switching back to HEAD

You can stash (save the changes in temporary box) then, back to master branch HEAD.

$ git add .
$ git stash
$ git checkout master

Jump Over Commits Back and Forth:

Go to a specific commit-sha.
```
  $ git checkout <commit-sha>
```

If you have uncommitted changes here then, you can checkout to a new branch | Add | Commit | Push the current branch to the remote.

  # checkout a new branch, add, commit, push
  $ git checkout -b <branch-name>
  $ git add .
  $ git commit -m 'Commit message'
  $ git push origin HEAD          # push the current branch to remote 

  $ git checkout master           # back to master branch now

If you have changes in the specific commit and don't want to keep the changes, you can do stash or reset then checkout to master (or, any other branch).
```
  # stash
  $ git add -A
  $ git stash
  $ git checkout master

  # reset
  $ git reset --hard HEAD
  $ git checkout master
```

After checking out a specific commit if you have no uncommitted change(s) then, just back to master or other branch.

  $ git status          # see the changes
  $ git checkout master

  # or, shortcut
  $ git checkout -      # back to the previous state

What are Transient and Volatile Modifiers?

The volatile and transient modifiers can be applied to fields of classes¹ irrespective of field type. Apart from that, they are unrelated.

The transient modifier tells the Java object serialization subsystem to exclude the field when serializing an instance of the class. When the object is then deserialized, the field will be initialized to the default value; i.e. null for a reference type, and zero or false for a primitive type. Note that the JLS (see 8.3.1.3) does not say what transient means, but defers to the Java Object Serialization Specification. Other serialization mechanisms may pay attention to a field's transient-ness. Or they may ignore it.

(Note that the JLS permits a static field to be declared as transient. This combination doesn't make sense for Java Object Serialization, since it doesn't serialize statics anyway. However, it could make sense in other contexts, so there is some justification for not forbidding it outright.)

The volatile modifier tells the JVM that writes to the field should always be synchronously flushed to memory, and that reads of the field should always read from memory. This means that fields marked as volatile can be safely accessed and updated in a multi-thread application without using native or standard library-based synchronization. Similarly, reads and writes to volatile fields are atomic. (This does not apply to >>non-volatile<< long or double fields, which may be subject to "word tearing" on some JVMs.) The relevant parts of the JLS are 8.3.1.4, 17.4 and 17.7.

^{1 - But not to local variables or parameters.}

Get hours difference between two dates in Moment Js

I know this is already answered but in case you want something recursive and more generic and not relying on moment fromNow you could use this function I created. Of course you can change its logic to adjust it to your needs to also support years and seconds.

var createdAt = moment('2019-05-13T14:23:00.607Z');
var expiresAt = moment('2019-05-14T14:23:00.563Z');

// You can also add years in the beginning of the array or seconds in its end
const UNITS = ["months", "weeks", "days", "hours", "minutes"]
function getValidFor (createdAt, expiresAt, unit = 'months') {
    const validForUnit = expiresAt.diff(createdAt, unit);
    // you could adjust the if to your needs 
    if (validForUnit > 1 || unit === "minutes") {
    return [validForUnit, unit];
  }
  return getValidFor(createdAt, expiresAt, UNITS[UNITS.indexOf(unit) + 1]);
}

Refresh a page using PHP

You can do it with PHP:

header("Refresh:0");

It refreshes your current page, and if you need to redirect it to another page, use following:

header("Refresh:0; url=page2.php");

Printing 1 to 1000 without loop or conditionals

I missed all the fun, all the good C++ answers have already been posted !

This is the weirdest thing I could come up with, I wouldn't bet it's legal C99 though :p

#include <stdio.h>

int i = 1;
int main(int argc, char *argv[printf("%d\n", i++)])
{
  return (i <= 1000) && main(argc, argv);
}

Another one, with a little cheating :

#include <stdio.h>
#include <boost/preprocessor.hpp>

#define ECHO_COUNT(z, n, unused) n+1
#define FORMAT_STRING(z, n, unused) "%d\n"

int main()
{
    printf(BOOST_PP_REPEAT(1000, FORMAT_STRING, ~), BOOST_PP_ENUM(LOOP_CNT, ECHO_COUNT, ~));
}

Last idea, same cheat :

#include <boost/preprocessor.hpp>
#include <iostream>

int main()
{
#define ECHO_COUNT(z, n, unused) BOOST_PP_STRINGIZE(BOOST_PP_INC(n))"\n"
    std::cout << BOOST_PP_REPEAT(1000, ECHO_COUNT, ~) << std::endl;
}

Can anyone recommend a simple Java web-app framework?

A common property of Java Web-apps is that they usually use servlets which usually means the web server also runs Java. This contributes to the perceived complexity, IMHO. But you can build Java apps in the traditional Unix-style of "do one thing and do it well" without having performance suffer.

You can also use SCGI, it is a lot simpler than FastCGI. I'd try that first. But if it doesn't work out:

How to write a FastCGI application in Java

Make an empty working directory and enter it
Download the FastCGI devkit: wget --quiet --recursive --no-parent --accept=java --no-directories --no-host-directories "http://www.fastcgi.com/devkit/java/"
mkdir -p com/fastcgi
mv *.java com/fastcgi
Now you need to apply a tiny patch to the devkit (replace operator == with <= on line 175 or use this script to do it):

echo -e "175c\nif (count <= 0) {\n.\nw\nn\nq" | ed -s com/fastcgi/FCGIInputStream.java
Create a test app, TinyFCGI.java (source below)
Compile everything: javac **/*.java (** will probably only work in zsh)
Start the FastCGI server: java -DFCGI_PORT=9884 TinyFCGI (leave it running in the background)
Now set up e.g. Apache to use the server:
- Using Apache 2.4, you can use mod_proxy_fcgi like this:
  1. Using Ubuntu, upgrade to Apache 2.4 using i.e. this PPA
  2. Enable the mod: sudo a2enmod proxy_fcgi
  3. Create /etc/apache2/conf-enabled/your_site.conf with the content below
  4. Restart Apache: sudo apache2ctl restart
Now you can access the webapp at http://localhost/your_site
Benchmark results below

`TinyFCGI.java`

import com.fastcgi.FCGIInterface;
import java.io.*;
import static java.lang.System.out;

class TinyFCGI {
    public static void main (String args[]) {
        int count = 0;
        FCGIInterface fcgiinterface = new FCGIInterface();
        while(fcgiinterface.FCGIaccept() >= 0) {
            count++;
            out.println("Content-type: text/html\n\n");
            out.println("<html>");
            out.println(
                "<head><TITLE>FastCGI-Hello Java stdio</TITLE></head>");
            out.println("<body>");
            out.println("<H3>FastCGI-HelloJava stdio</H3>");
            out.println("request number " + count +
                               " running on host "
                               + System.getProperty("SERVER_NAME"));
            out.println("</body>");
            out.println("</html>");
        }
    }
}

`your_site.conf`

<Location /your_site>
  ProxyPass fcgi://localhost:9884/
</Location>

Benchmark results

wrk

$ ./wrk -t1 -c100 -r10000 http://localhost/your_site 
Making 10000 requests to http://localhost/your_site
  1 threads and 100 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     3.58s    13.42s    1.06m    94.42%
    Req/Sec     0.00      0.00     0.00    100.00%
  10000 requests in 1.42m, 3.23MB read
  Socket errors: connect 0, read 861, write 0, timeout 2763
  Non-2xx or 3xx responses: 71
Requests/sec:    117.03
Transfer/sec:     38.70KB

$ ab -n 10000 -c 100 localhost:8800/your_site
Concurrency Level:      100
Time taken for tests:   12.640 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Total transferred:      3180000 bytes
HTML transferred:       1640000 bytes
Requests per second:    791.11 [#/sec] (mean)
Time per request:       126.404 [ms] (mean)
Time per request:       1.264 [ms] (mean, across all concurrent requests)
Transfer rate:          245.68 [Kbytes/sec] received

siege

$ siege -r 10000 -c 100 "http://localhost:8800/your_site"
** SIEGE 2.70
** Preparing 100 concurrent users for battle.
The server is now under siege...^C
Lifting the server siege...      done.
Transactions:              89547 hits
Availability:             100.00 %
Elapsed time:             447.93 secs
Data transferred:          11.97 MB
Response time:              0.00 secs
Transaction rate:         199.91 trans/sec
Throughput:             0.03 MB/sec
Concurrency:                0.56
Successful transactions:       89547
Failed transactions:               0
Longest transaction:            0.08
Shortest transaction:           0.00

cleanest way to skip a foreach if array is empty

foreach((array)$items as $item) {}

Any way to make a WPF textblock selectable?

Apply this style to your TextBox and that's it (inspired from this article):

<Style x:Key="SelectableTextBlockLikeStyle" TargetType="TextBox" BasedOn="{StaticResource {x:Type TextBox}}">
    <Setter Property="IsReadOnly" Value="True"/>
    <Setter Property="IsTabStop" Value="False"/>
    <Setter Property="BorderThickness" Value="0"/>
    <Setter Property="Background" Value="Transparent"/>
    <Setter Property="Padding" Value="-2,0,0,0"/>
    <!-- The Padding -2,0,0,0 is required because the TextBox
        seems to have an inherent "Padding" of about 2 pixels.
        Without the Padding property,
        the text seems to be 2 pixels to the left
        compared to a TextBlock
    -->
    <Style.Triggers>
        <MultiTrigger>
            <MultiTrigger.Conditions>
                <Condition Property="IsMouseOver" Value="False" />
                <Condition Property="IsFocused" Value="False" />
            </MultiTrigger.Conditions>
            <Setter Property="Template">
                <Setter.Value>
                <ControlTemplate TargetType="{x:Type TextBox}">
                    <TextBlock Text="{TemplateBinding Text}" 
                             FontSize="{TemplateBinding FontSize}"
                             FontStyle="{TemplateBinding FontStyle}"
                             FontFamily="{TemplateBinding FontFamily}"
                             FontWeight="{TemplateBinding FontWeight}"
                             TextWrapping="{TemplateBinding TextWrapping}"
                             Foreground="{DynamicResource NormalText}"
                             Padding="0,0,0,0"
                                       />
                </ControlTemplate>
                </Setter.Value>
            </Setter>
        </MultiTrigger>
    </Style.Triggers>
</Style>

How to add chmod permissions to file in Git?

Antwane's answer is correct, and this should be a comment but comments don't have enough space and do not allow formatting. :-) I just want to add that in Git, file permissions are recorded only¹ as either 644 or 755 (spelled (100644 and 100755; the 100 part means "regular file"):

diff --git a/path b/path
new file mode 100644

The former—644—means that the file should not be executable, and the latter means that it should be executable. How that turns into actual file modes within your file system is somewhat OS-dependent. On Unix-like systems, the bits are passed through your umask setting, which would normally be 022 to remove write permission from "group" and "other", or 002 to remove write permission only from "other". It might also be 077 if you are especially concerned about privacy and wish to remove read, write, and execute permission from both "group" and "other".

¹Extremely-early versions of Git saved group permissions, so that some repositories have tree entries with mode 664 in them. Modern Git does not, but since no part of any object can ever be changed, those old permissions bits still persist in old tree objects.

The change to store only 0644 or 0755 was in commit e44794706eeb57f2, which is before Git v0.99 and dated 16 April 2005.

Is it ok to scrape data from Google results?

Google thrives on scraping websites of the world...so if it was "so illegal" then even Google won't survive ..of course other answers mention ways of mitigating IP blocks by Google. One more way to explore avoiding captcha could be scraping at random times (dint try) ..Moreover, I have a feeling, that if we provide novelty or some significant processing of data then it sounds fine at least to me...if we are simply copying a website.. or hampering its business/brand in some way...then it is bad and should be avoided..on top of it all...if you are a startup then no one will fight you as there is no benefit.. but if your entire premise is on scraping even when you are funded then you should think of more sophisticated ways...alternative APIs..eventually..Also Google keeps releasing (or depricating) fields for its API so what you want to scrap now may be in roadmap of new Google API releases..

Splitting String with delimiter

split doesn't work that way in groovy. you have to use tokenize...

See the docs:

http://groovy-lang.org/gdk.html#split()

Right align text in android TextView

Make the (LinearLayout) android:layout_width="match_parent" and the TextView's android:layout_gravity="right"

Escaping ampersand in URL

They need to be percent-encoded:

> encodeURIComponent('&')
"%26"

So in your case, the URL would look like:

http://www.mysite.com?candy_name=M%26M

PHP case-insensitive in_array function

/**
 * in_array function variant that performs case-insensitive comparison when needle is a string.
 *
 * @param mixed $needle
 * @param array $haystack
 * @param bool $strict
 *
 * @return bool
 */
function in_arrayi($needle, array $haystack, bool $strict = false): bool
{

    if (is_string($needle)) {

        $needle = strtolower($needle);

        foreach ($haystack as $value) {

            if (is_string($value)) {
                if (strtolower($value) === $needle) {
                    return true;
                }
            }

        }

        return false;

    }

    return in_array($needle, $haystack, $strict);

}


/**
 * in_array function variant that performs case-insensitive comparison when needle is a string.
 * Multibyte version.
 *
 * @param mixed $needle
 * @param array $haystack
 * @param bool $strict
 * @param string|null $encoding
 *
 * @return bool
 */
function mb_in_arrayi($needle, array $haystack, bool $strict = false, ?string $encoding = null): bool
{

    if (null === $encoding) {
        $encoding = mb_internal_encoding();
    }

    if (is_string($needle)) {

        $needle = mb_strtolower($needle, $encoding);

        foreach ($haystack as $value) {

            if (is_string($value)) {
                if (mb_strtolower($value, $encoding) === $needle) {
                    return true;
                }
            }

        }

        return false;

    }

    return in_array($needle, $haystack, $strict);

}

How do I extract data from a DataTable?

Unless you have a specific reason to do raw ado.net I would have a look at using an ORM (object relational mapper) like nHibernate or LINQ to SQL. That way you can query the database and retrieve objects to work with which are strongly typed and easier to work with IMHO.

Inconsistent Accessibility: Parameter type is less accessible than method

Try making your constructor private like this:

private Foo newClass = new Foo();

How to trigger the window resize event in JavaScript?

I believe this should work for all browsers:

var event;
if (typeof (Event) === 'function') {
    event = new Event('resize');
} else { /*IE*/
    event = document.createEvent('Event');
    event.initEvent('resize', true, true);
}
window.dispatchEvent(event);

PDO mysql: How to know if insert was successful

PDOStatement->execute() returns true on success. There is also PDOStatement->errorCode() which you can check for errors.

C# : assign data to properties via constructor vs. instantiating

Second approach is object initializer in C#

Object initializers let you assign values to any accessible fields or properties of an object at creation time without having to explicitly invoke a constructor.

The first approach

var albumData = new Album("Albumius", "Artistus", 2013);

explicitly calls the constructor, whereas in second approach constructor call is implicit. With object initializer you can leave out some properties as well. Like:

 var albumData = new Album
        {
            Name = "Albumius",
        };

Object initializer would translate into something like:

var albumData; 
var temp = new Album();
temp.Name = "Albumius";
temp.Artist = "Artistus";
temp.Year = 2013;
albumData = temp;

Why it uses a temporary object (in debug mode) is answered here by Jon Skeet.

As far as advantages for both approaches are concerned, IMO, object initializer would be easier to use specially if you don't want to initialize all the fields. As far as performance difference is concerned, I don't think there would any since object initializer calls the parameter less constructor and then assign the properties. Even if there is going to be performance difference it should be negligible.

Looping through rows in a DataView

You can iterate DefaultView as the following code by Indexer:

DataTable dt = new DataTable();
// add some rows to your table
// ...
dt.DefaultView.Sort = "OneColumnName ASC"; // For example
for (int i = 0; i < dt.Rows.Count; i++)
{
    DataRow oRow = dt.DefaultView[i].Row;
    // Do your stuff with oRow
    // ...
}

android start activity from service

UPDATE ANDROID 10 AND HIGHER

Start an activity from service (foreground or background) is no longer allowed.

There are still some restrictions that can be seen in the documentation

https://developer.android.com/guide/components/activities/background-starts

Checking whether a String contains a number value in Java

Using a loop -

public static boolean containsDigit(final String aString)
{
    if (aString != null && !aString.isEmpty())
    {
        for (char c : aString.toCharArray())
        {
            if (Character.isDigit(c))
            {
                return true;
            }
        }
    }

    return false;
}

Using a stream -

public static boolean containsDigit(final String aString)
{
    return aString != null && !aString.isEmpty() &&
            aString.chars().anyMatch(Character::isDigit);
}

How to check java bit version on Linux?

Why don't you examine System.getProperty("os.arch") value in your code?

Correct way to quit a Qt program?

If you're using Qt Jambi, this should work:

QApplication.closeAllWindows();

How to generate xsd from wsdl

(WHEN .wsdl is referring to .xsd/schemas using import) If you're using the WMB Tooklit (v8.0.0.4 WMB) then you can find .xsd using following steps :

Create library (optional) > Right Click , New Message Model File > Select SOAP XML > Choose Option 'I already have WSDL for my data' > 'Select file outside workspace' > 'Select the WSDL bindings to Import' (if there are multiple) > Finish.

This will give you the .xsd and .wsdl files in your Workspace (Application Perspective).

Call child component method from parent class - Angular

This Worked for me ! For Angular 2 , Call child component method in parent component

Parent.component.ts

    import { Component, OnInit, ViewChild } from '@angular/core';
    import { ChildComponent } from '../child/child'; 
    @Component({ 
               selector: 'parent-app', 
               template: `<child-cmp></child-cmp>` 
              }) 
    export class parentComponent implements OnInit{ 
        @ViewChild(ChildComponent ) child: ChildComponent ; 

        ngOnInit() { 
           this.child.ChildTestCmp(); } 
}

Child.component.ts

import { Component } from '@angular/core';
@Component({ 
  selector: 'child-cmp', 
  template: `<h2> Show Child Component</h2><br/><p> {{test }}</p> ` 
})
export class ChildComponent {
  test: string;
  ChildTestCmp() 
  { 
    this.test = "I am child component!"; 
  }
 }

CSS body background image fixed to full screen even when zooming in/out

I've used these techniques before and they both work well. If you read the pros/cons of each you can decide which is right for your site.

Alternatively you could use the full size background image jQuery plugin if you want to get away from the bugs in the above.

Does Java have something like C#'s ref and out keywords?

Like many others, I needed to convert a C# project to Java. I did not find a complete solution on the web regarding out and ref modifiers. But, I was able to take the information I found, and expand upon it to create my own classes to fulfill the requirements. I wanted to make a distinction between ref and out parameters for code clarity. With the below classes, it is possible. May this information save others time and effort.

An example is included in the code below.

//*******************************************************************************************
//XOUT CLASS
//*******************************************************************************************
public class XOUT<T>
{
    public XOBJ<T> Obj = null;

    public XOUT(T value)
    {
        Obj = new XOBJ<T>(value);
    }

    public XOUT()
    {
      Obj = new XOBJ<T>();
    }

    public XOUT<T> Out()
    {
        return(this);
    }

    public XREF<T> Ref()
    {
        return(Obj.Ref());
    }
};

//*******************************************************************************************
//XREF CLASS
//*******************************************************************************************

public class XREF<T>
{
    public XOBJ<T> Obj = null;

    public XREF(T value)
    {
        Obj = new XOBJ<T>(value);
    }

    public XREF()
    {
      Obj = new XOBJ<T>();
    }

    public XOUT<T> Out()
    {
        return(Obj.Out());
    }

    public XREF<T> Ref()
    {
        return(this);
    }
};

//*******************************************************************************************
//XOBJ CLASS
//*******************************************************************************************
/**
 *
 * @author jsimms
 */
/*
    XOBJ is the base object that houses the value. XREF and XOUT are classes that
    internally use XOBJ. The classes XOBJ, XREF, and XOUT have methods that allow
    the object to be used as XREF or XOUT parameter; This is important, because
    objects of these types are interchangeable.

    See Method:
       XXX.Ref()
       XXX.Out()

    The below example shows how to use XOBJ, XREF, and XOUT;
    //
    // Reference parameter example
    //
    void AddToTotal(int a, XREF<Integer> Total)
    {
       Total.Obj.Value += a;
    }

    //
    // out parameter example
    //
    void Add(int a, int b, XOUT<Integer> ParmOut)
    {
       ParmOut.Obj.Value = a+b;
    }

    //
    // XOBJ example
    //
    int XObjTest()
    {
       XOBJ<Integer> Total = new XOBJ<>(0);
       Add(1, 2, Total.Out());    // Example of using out parameter
       AddToTotal(1,Total.Ref()); // Example of using ref parameter
       return(Total.Value);
    }
*/


public class XOBJ<T> {

    public T Value;

    public  XOBJ() {

    }

    public XOBJ(T value) {
        this.Value = value;
    }

    //
    // Method: Ref()
    // Purpose: returns a Reference Parameter object using the XOBJ value
    //
    public XREF<T> Ref()
    {
        XREF<T> ref = new XREF<T>();
        ref.Obj = this;
        return(ref);
    }

    //
    // Method: Out()
    // Purpose: returns an Out Parameter Object using the XOBJ value
    //
    public XOUT<T> Out()
    {
        XOUT<T> out = new XOUT<T>();
        out.Obj = this;
        return(out);
    }

    //
    // Method get()
    // Purpose: returns the value
    // Note: Because this is combersome to edit in the code,
    // the Value object has been made public
    //
    public T get() {
        return Value;
    }

    //
    // Method get()
    // Purpose: sets the value
    // Note: Because this is combersome to edit in the code,
    // the Value object has been made public
    //
    public void set(T anotherValue) {
        Value = anotherValue;
    }

    @Override
    public String toString() {
        return Value.toString();
    }

    @Override
    public boolean equals(Object obj) {
        return Value.equals(obj);
    }

    @Override
    public int hashCode() {
        return Value.hashCode();
    }
}

How to override the path of PHP to use the MAMP path?

This one worked for me:

sudo mv /usr/bin/php /usr/bin/~php
sudo ln -s /Application/XAMPP/xamppfiles/bin/php /usb/bin/php

Get the last day of the month in SQL

For SQL server 2012 or above use EOMONTH to get the last date of month

SQL query to display end date of current month

DECLARE @currentDate DATE = GETDATE()
SELECT EOMONTH (@currentDate) AS CurrentMonthED

SQL query to display end date of Next month

DECLARE @currentDate DATE = GETDATE()
SELECT EOMONTH (@currentDate, 1 ) AS NextMonthED

Redirect from asp.net web api post action

Sure:

public HttpResponseMessage Post()
{
    // ... do the job

    // now redirect
    var response = Request.CreateResponse(HttpStatusCode.Moved);
    response.Headers.Location = new Uri("http://www.abcmvc.com");
    return response;
}

Windows command prompt log to a file

In cmd when you use > or >> the output will be only written on the file. Is it possible to see the output in the cmd windows and also save it in a file. Something similar if you use teraterm, when you can start saving all the log in a file meanwhile you use the console and view it (only for ssh, telnet and serial).

Python style - line continuation with strings?

I've gotten around this with

mystr = ' '.join(
        ["Why, hello there",
         "wonderful stackoverflow people!"])

in the past. It's not perfect, but it works nicely for very long strings that need to not have line breaks in them.

Specified cast is not valid?

htmlStr is string then You need to Date and Time variables to string

while (reader.Read())
                {
                    DateTime Date = reader.GetDateTime(0);
                    DateTime Time = reader.GetDateTime(1);
                    htmlStr += "<tr><td>" + Date.ToString() + "</td><td>"  + 
                    Time.ToString() + "</td></tr>";                  
                }

Escape double quotes in Java

For a String constant you have no choice other than escaping via backslash.

Maybe you find the MyBatis project interesting. It is a thin layer over JDBC where you can externalize your SQL queries in XML configuration files without the need to escape double quotes.

What is the difference between hg forget and hg remove?

If you use "hg remove b" against a file with "A" status, which means it has been added but not commited, Mercurial will respond:

  not removing b: file has been marked for add (use forget to undo)

This response is a very clear explication of the difference between remove and forget.

My understanding is that "hg forget" is for undoing an added but not committed file so that it is not tracked by version control; while "hg remove" is for taking out a committed file from version control.

This thread has a example for using hg remove against files of 7 different types of status.

'System.Reflection.TargetInvocationException' occurred in PresentationFramework.dll

I think you will have fewer problems if you declared a Property that implements INotifyPropertyChanged, then databind IsChecked, SelectedIndex(using IValueConverter) and Fill(using IValueConverter) to it instead of using the Checked Event to toggle SelectedIndex and Fill.

AngularJS - difference between pristine/dirty and touched/untouched

This is a late answer but hope this might help.

Scenario 1: You visited the site for first time and did not touch any field. The state of form is

ng-untouched and ng-pristine

Scenario 2: You are currently entering the values in a particular field in the form. Then the state is

ng-untouched and ng-dirty

Scenario 3: You are done with entering the values in the field and moved to next field

ng-touched and ng-dirty

Scenario 4: Say a form has a phone number field . You have entered the number but you have actually entered 9 digits but there are 10 digits required for a phone number.Then the state is ng-invalid

In short:

ng-untouched:When the form field has not been visited yet

ng-touched: When the form field is visited AND the field has lost focus

ng-pristine: The form field value is not changed

ng-dirty: The form field value is changed

ng-valid : When all validations of form fields are successful

ng-invalid: When all validations of form fields are not successful

How to start/stop/restart a thread in Java?

Once a thread stops you cannot restart it. However, there is nothing stopping you from creating and starting a new thread.

Option 1: Create a new thread rather than trying to restart.

Option 2: Instead of letting the thread stop, have it wait and then when it receives notification you can allow it to do work again. This way the thread never stops and will never need to be restarted.

Edit based on comment:

To "kill" the thread you can do something like the following.

yourThread.setIsTerminating(true); // tell the thread to stop
yourThread.join(); // wait for the thread to stop

How to escape single quotes in MySQL

' is the escape character. So your string should be:

This is Ashok''s Pen

If you are using some front-end code, you need to do a string replace before sending the data to the stored procedure.

For example, in C# you can do

value = value.Replace("'", "''");

and then pass value to the stored procedure.

Passing a dictionary to a function as keyword parameters

Figured it out for myself in the end. It is simple, I was just missing the ** operator to unpack the dictionary

So my example becomes:

d = dict(p1=1, p2=2)
def f2(p1,p2):
    print p1, p2
f2(**d)

Is an empty href valid?

A word of caution:

In my experience, omitting the href attribute causes problems for accessibility as the keyboard navigation will ignore it and never give it focus like it will when href is present. Manually including your element in the tabindex is a way around that.

Objective-C: Calling selectors with multiple arguments

iOS users also expect autocapitalization: In a standard text field, the first letter of a sentence in a case-sensitive language is automatically capitalized.

You can decide whether or not to implement such features; there is no dedicated API for any of the features just listed, so providing them is a competitive advantage.

Apple document is saying there is no API available for this feature and some other expected feature in a customkeyboard. so you need to find out your own logic to implement this.

How to set thymeleaf th:field value from other variable

It has 2 possible solutions:

1) You can set it in the view by javascript... (not recomended)

<input class="form-control"
       type="text"
       id="tbFormControll"
       th:field="*{clientName}"/>

<script type="text/javascript">
        document.getElementById("tbFormControll").value = "default";
</script>

2) Or the better solution is to set the value in the model, that you attach to the view in GET operation by a controller. You can also change the value in the controller, just make a Java object from $client.name and call setClientName.

public class FormControllModel {
    ...
    private String clientName = "default";
    public String getClientName () {
        return clientName;
    }
    public void setClientName (String value) {
        clientName = value;
    }
    ...
}

I hope it helps.

How to make rounded percentages add up to 100%

I think the following will achieve what you are after

function func( orig, target ) {

    var i = orig.length, j = 0, total = 0, change, newVals = [], next, factor1, factor2, len = orig.length, marginOfErrors = [];

    // map original values to new array
    while( i-- ) {
        total += newVals[i] = Math.round( orig[i] );
    }

    change = total < target ? 1 : -1;

    while( total !== target ) {

        // Iterate through values and select the one that once changed will introduce
        // the least margin of error in terms of itself. e.g. Incrementing 10 by 1
        // would mean an error of 10% in relation to the value itself.
        for( i = 0; i < len; i++ ) {

            next = i === len - 1 ? 0 : i + 1;

            factor2 = errorFactor( orig[next], newVals[next] + change );
            factor1 = errorFactor( orig[i], newVals[i] + change );

            if(  factor1 > factor2 ) {
                j = next; 
            }
        }

        newVals[j] += change;
        total += change;
    }


    for( i = 0; i < len; i++ ) { marginOfErrors[i] = newVals[i] && Math.abs( orig[i] - newVals[i] ) / orig[i]; }

    // Math.round() causes some problems as it is difficult to know at the beginning
    // whether numbers should have been rounded up or down to reduce total margin of error. 
    // This section of code increments and decrements values by 1 to find the number
    // combination with least margin of error.
    for( i = 0; i < len; i++ ) {
        for( j = 0; j < len; j++ ) {
            if( j === i ) continue;

            var roundUpFactor = errorFactor( orig[i], newVals[i] + 1)  + errorFactor( orig[j], newVals[j] - 1 );
            var roundDownFactor = errorFactor( orig[i], newVals[i] - 1) + errorFactor( orig[j], newVals[j] + 1 );
            var sumMargin = marginOfErrors[i] + marginOfErrors[j];

            if( roundUpFactor < sumMargin) { 
                newVals[i] = newVals[i] + 1;
                newVals[j] = newVals[j] - 1;
                marginOfErrors[i] = newVals[i] && Math.abs( orig[i] - newVals[i] ) / orig[i];
                marginOfErrors[j] = newVals[j] && Math.abs( orig[j] - newVals[j] ) / orig[j];
            }

            if( roundDownFactor < sumMargin ) { 
                newVals[i] = newVals[i] - 1;
                newVals[j] = newVals[j] + 1;
                marginOfErrors[i] = newVals[i] && Math.abs( orig[i] - newVals[i] ) / orig[i];
                marginOfErrors[j] = newVals[j] && Math.abs( orig[j] - newVals[j] ) / orig[j];
            }

        }
    }

    function errorFactor( oldNum, newNum ) {
        return Math.abs( oldNum - newNum ) / oldNum;
    }

    return newVals;
}


func([16.666, 16.666, 16.666, 16.666, 16.666, 16.666], 100); // => [16, 16, 17, 17, 17, 17]
func([33.333, 33.333, 33.333], 100); // => [34, 33, 33]
func([33.3, 33.3, 33.3, 0.1], 100); // => [34, 33, 33, 0] 
func([13.25, 47.25, 11.25, 28.25], 100 ); // => [13, 48, 11, 28]
func( [25.5, 25.5, 25.5, 23.5], 100 ); // => [25, 25, 26, 24]

One last thing, I ran the function using the numbers originally given in the question to compare to the desired output

func([13.626332, 47.989636, 9.596008, 28.788024], 100); // => [48, 29, 13, 10]

This was different to what the question wanted => [ 48, 29, 14, 9]. I couldn't understand this until I looked at the total margin of error

-------------------------------------------------
| original  | question | % diff | mine | % diff |
-------------------------------------------------
| 13.626332 | 14       | 2.74%  | 13   | 4.5%   |
| 47.989636 | 48       | 0.02%  | 48   | 0.02%  |
| 9.596008  | 9        | 6.2%   | 10   | 4.2%   |
| 28.788024 | 29       | 0.7%   | 29   | 0.7%   |
-------------------------------------------------
| Totals    | 100      | 9.66%  | 100  | 9.43%  |
-------------------------------------------------

Essentially, the result from my function actually introduces the least amount of error.

Fiddle here

Java keytool easy way to add server cert from url/port

You can export a certificate using Firefox, this site has instructions. Then you use keytool to add the certificate.

How to convert numbers to alphabet?

If you have a number, for example 65, and if you want to get the corresponding ASCII character, you can use the chr function, like this

>>> chr(65)
'A'

similarly if you have 97,

>>> chr(97)
'a'

EDIT: The above solution works for 8 bit characters or ASCII characters. If you are dealing with unicode characters, you have to specify unicode value of the starting character of the alphabet to ord and the result has to be converted using unichr instead of chr.

>>> print unichr(ord(u'\u0B85'))
?

>>> print unichr(1 + ord(u'\u0B85'))
?

NOTE: The unicode characters used here are of the language called "Tamil", my first language. This is the unicode table for the same http://www.unicode.org/charts/PDF/U0B80.pdf

Is there a way to make HTML5 video fullscreen?

From CSS

video {
    position: fixed; right: 0; bottom: 0;
    min-width: 100%; min-height: 100%;
    width: auto; height: auto; z-index: -100;
    background: url(polina.jpg) no-repeat;
    background-size: cover;
}

What is the significance of load factor in HashMap?

From the documentation:

The load factor is a measure of how full the hash table is allowed to get before its capacity is automatically increased

It really depends on your particular requirements, there's no "rule of thumb" for specifying an initial load factor.

Clang vs GCC - which produces faster binaries?

Phoronix did some benchmarks about this, but it is about a snapshot version of Clang/LLVM from a few months back. The results being that things were more-or-less a push; neither GCC nor Clang is definitively better in all cases.

Since you'd use the latest Clang, it's maybe a little less relevant. Then again, GCC 4.6 is slated to have some major optimizations for Core 2 and i7, apparently.

I figure Clang's faster compilation speed will be nicer for original developers, and then when you push the code out into the world, Linux distro/BSD/etc. end-users will use GCC for the faster binaries.

MVC4 StyleBundle not resolving images

Grinn solution is great.

However it doesn't work for me when there are parent folder relative references in the url. i.e. url('../../images/car.png')

So, I slightly changed the Include method in order to resolve the paths for each regex match, allowing relative paths and also to optionally embed the images in the css.

I also changed the IF DEBUG to check BundleTable.EnableOptimizations instead of HttpContext.Current.IsDebuggingEnabled.

    public new Bundle Include(params string[] virtualPaths)
    {
        if (!BundleTable.EnableOptimizations)
        {
            // Debugging. Bundling will not occur so act normal and no one gets hurt. 
            base.Include(virtualPaths.ToArray());
            return this;
        }
        var bundlePaths = new List<string>();
        var server = HttpContext.Current.Server;
        var pattern = new Regex(@"url\s*\(\s*([""']?)([^:)]+)\1\s*\)", RegexOptions.IgnoreCase);
        foreach (var path in virtualPaths)
        {
            var contents = File.ReadAllText(server.MapPath(path));
            var matches = pattern.Matches(contents);
            // Ignore the file if no matches
            if (matches.Count == 0)
            {
                bundlePaths.Add(path);
                continue;
            }
            var bundlePath = (System.IO.Path.GetDirectoryName(path) ?? string.Empty).Replace(@"\", "/") + "/";
            var bundleUrlPath = VirtualPathUtility.ToAbsolute(bundlePath);
            var bundleFilePath = string.Format("{0}{1}.bundle{2}",
                                               bundlePath,
                                               System.IO.Path.GetFileNameWithoutExtension(path),
                                               System.IO.Path.GetExtension(path));
            // Transform the url (works with relative path to parent folder "../")
            contents = pattern.Replace(contents, m =>
            {
                var relativeUrl = m.Groups[2].Value;
                var urlReplace = GetUrlReplace(bundleUrlPath, relativeUrl, server);
                return string.Format("url({0}{1}{0})", m.Groups[1].Value, urlReplace);
            });
            File.WriteAllText(server.MapPath(bundleFilePath), contents);
            bundlePaths.Add(bundleFilePath);
        }
        base.Include(bundlePaths.ToArray());
        return this;
    }


    private string GetUrlReplace(string bundleUrlPath, string relativeUrl, HttpServerUtility server)
    {
        // Return the absolute uri
        Uri baseUri = new Uri("http://dummy.org");
        var absoluteUrl = new Uri(new Uri(baseUri, bundleUrlPath), relativeUrl).AbsolutePath;
        var localPath = server.MapPath(absoluteUrl);
        if (IsEmbedEnabled && File.Exists(localPath))
        {
            var fi = new FileInfo(localPath);
            if (fi.Length < 0x4000)
            {
                // Embed the image in uri
                string contentType = GetContentType(fi.Extension);
                if (null != contentType)
                {
                    var base64 = Convert.ToBase64String(File.ReadAllBytes(localPath));
                    // Return the serialized image
                    return string.Format("data:{0};base64,{1}", contentType, base64);
                }
            }
        }
        // Return the absolute uri 
        return absoluteUrl;
    }

Hope it helps, regards.

jQuery or Javascript - how to disable window scroll without overflow:hidden;

CSS 'fixed' solution (like Facebook does):

body_temp = $("<div class='body_temp' />")
    .append($('body').contents())
    .css('position', 'fixed')
    .css('top', "-" + scrolltop + 'px')
    .width($(window).width())
    .appendTo('body');

to toggle to normal state:

var scrolltop = Math.abs($('.body_temp').position().top);
$('body').append($('.body_temp').contents()).scrollTop(scrolltop);

Align image to left of text on same line - Twitter Bootstrap3

I would use Bootstrap's grid to achieve the desired result. The class="img-responsive" works nicely. Something like:

    <div class="container-fluid">
        <div class="row">
            <div class="col-md-3"><img src="./pictures/placeholder.jpg" class="img-responsive" alt="Some picture" width="410" height="307"></div>
            <div class="col-md-9"><h1>Heading</h1><p>Your Information.</p></div>
        </div>
    </div>

how to sort order of LEFT JOIN in SQL query?

This will get you the most expensive car for the user:

SELECT users.userName, MAX(cars.carPrice)
FROM users
LEFT JOIN cars ON cars.belongsToUser=users.id
WHERE users.id=4
GROUP BY users.userName

However, this statement makes me think that you want all of the cars prices sorted, descending:

So question: How do I set the LEFT JOIN table to be ordered by carPrice, DESC ?

So you could try this:

SELECT users.userName, cars.carPrice
FROM users
LEFT JOIN cars ON cars.belongsToUser=users.id
WHERE users.id=4
GROUP BY users.userName
ORDER BY users.userName ASC, cars.carPrice DESC

Ruby on Rails form_for select field with class

Try this way:

<%= f.select(:object_field, ['Item 1', ...], {}, { :class => 'my_style_class' }) %>

select helper takes two options hashes, one for select, and the second for html options. So all you need is to give default empty options as first param after list of items and then add your class to html_options.

http://api.rubyonrails.org/classes/ActionView/Helpers/FormOptionsHelper.html#method-i-select

How to pass a vector to a function?

You're using the argument as a reference but actually it's a pointer. Change vector<int>* to vector<int>&. And you should really set search4 to something before using it.

How do I pass multiple ints into a vector at once?

You can also use vector::insert.

std::vector<int> v;
int a[5] = {2, 5, 8, 11, 14};

v.insert(v.end(), a, a+5);

Edit:

Of course, in real-world programming you should use:

v.insert(v.end(), a, a+(sizeof(a)/sizeof(a[0])));  // C++03
v.insert(v.end(), std::begin(a), std::end(a));     // C++11

Source file not compiled Dev C++

Install new version of Dev c++. It works fine in Windows 8. It also supports 64 bit version.

Download link is http://sourceforge.net/projects/orwelldevcpp/ .

Get selected option text with JavaScript

Plain JavaScript

var sel = document.getElementById("box1");
var text= sel.options[sel.selectedIndex].text;

jQuery:

$("#box1 option:selected").text();

Xcode warning: "Multiple build commands for output file"

This is not a bug. Xcode assists can assist you. Select the target, to the left in the project Navigator. Click on "Validate settings" at the bottom of the settings. Xcode will check the settings and removes duplicates if possible.

The difference between "require(x)" and "import x"

Let me give an example for Including express module with require & import

-require

var express = require('express');

-import

import * as  express from 'express';

So after using any of the above statement we will have a variable called as 'express' with us. Now we can define 'app' variable as,

var app = express();

So we use 'require' with 'CommonJS' and 'import' with 'ES6'.

For more info on 'require' & 'import', read through below links.

require - Requiring modules in Node.js: Everything you need to know

import - An Update on ES6 Modules in Node.js

Pandas get the most frequent values of a column

my best solution to get the first is

 df['my_column'].value_counts().sort_values(ascending=False).argmax()

Can we convert a byte array into an InputStream in Java?

If you use Robert Harder's Base64 utility, then you can do:

InputStream is = new Base64.InputStream(cph);

Or with sun's JRE, you can do:

InputStream is = new
com.sun.xml.internal.messaging.saaj.packaging.mime.util.BASE64DecoderStream(cph)

However don't rely on that class continuing to be a part of the JRE, or even continuing to do what it seems to do today. Sun say not to use it.

There are other Stack Overflow questions about Base64 decoding, such as this one.

Finding the max/min value in an array of primitives using Java

The basic way to get the min/max value of an Array. If you need the unsorted array, you may create a copy or pass it to a method that returns the min or max. If not, sorted array is better since it performs faster in some cases.

public class MinMaxValueOfArray {
    public static void main(String[] args) {
        int[] A = {2, 4, 3, 5, 5};
        Arrays.sort(A);
        int min = A[0];
        int max = A[A.length -1];
        System.out.println("Min Value = " + min);        
        System.out.println("Max Value = " + max);
    }
}

Set and Get Methods in java?

this is the code for set method

public void setAge(int age){
  this.age = age;
}

Resizing Images in VB.NET

This is basically Muhammad Saqib's answer except two diffs:

1: Adds width and height function parameters.

2: This is a small nuance which can be ignored... Saying 'As Bitmap', instead of 'As Image'. 'As Image' does work just fine. I just prefer to match Return types. See Image VS Bitmap Class.

Public Shared Function ResizeImage(ByVal InputBitmap As Bitmap, width As Integer, height As Integer) As Bitmap
    Return New Bitmap(InputImage, New Size(width, height))
End Function

Ex.

Dim someimage As New Bitmap("C:\somefile")
someimage = ResizeImage(someimage,800,600)

What is the difference between exit(0) and exit(1) in C?

exit() should always be called with an integer value and non-zero values are used as error codes.

Read a text file line by line in Qt

Use this code:

QFile inputFile(fileName);
if (inputFile.open(QIODevice::ReadOnly))
{
   QTextStream in(&inputFile);
   while (!in.atEnd())
   {
      QString line = in.readLine();
      ...
   }
   inputFile.close();
}

How to check a string starts with numeric number?

Sorry I didn't see your Java tag, was reading question only. I'll leave my other answers here anyway since I've typed them out.

Java

String myString = "9Hello World!";
if ( Character.isDigit(myString.charAt(0)) )
{
    System.out.println("String begins with a digit");
}

C++:

string myString = "2Hello World!";

if (isdigit( myString[0]) )
{
    printf("String begins with a digit");
}

Regular expression:

\b[0-9]

Some proof my regex works: Unless my test data is wrong?

Checking if output of a command contains a certain string in a shell script

Testing $? is an anti-pattern.

if ./somecommand | grep -q 'string'; then
  echo "matched"
fi

Dropping connected users in Oracle database

Do a query:

SELECT * FROM v$session s;

Find your user and do the next query (with appropriate parameters):

ALTER SYSTEM KILL SESSION '<SID>, <SERIAL>';

When using a Settings.settings file in .NET, where is the config actually stored?

If your settings file is in a web app, they will be in teh web.config file (right below your project. If they are in any other type of project, they will be in the app.config file (also below your project).

Edit

As is pointed out in the comments: your design time application settings are in an app.config file for applications other than web applications. When you build, the app.config file is copied to the output directory, and will be named yourexename.exe.config. At runtime, only the file named yourexename.exe.config will be read.

How can I change the text color with jQuery?

Place the following in your jQuery mouseover event handler:

$(this).css('color', 'red');

To set both color and size at the same time:

$(this).css({ 'color': 'red', 'font-size': '150%' });

You can set any CSS attribute using the .css() jQuery function.

How is VIP swapping + CNAMEs better than IP swapping + A records?

A VIP swap is an internal change to Azure's routers/load balancers, not an external DNS change. They're just routing traffic to go from one internal [set of] server[s] to another instead. Therefore the DNS info for mysite.cloudapp.net doesn't change at all. Therefore the change for people accessing via the IP bound to mysite.cloudapp.net (and CNAME'd by you) will see the change as soon as the VIP swap is complete.

How to deal with floating point number precision in JavaScript?

If you don't want to think about having to call functions each time, you can create a Class that handles conversion for you.

class Decimal {
  constructor(value = 0, scale = 4) {
    this.intervalValue = value;
    this.scale = scale;
  }

  get value() {
    return this.intervalValue;
  }

  set value(value) {
    this.intervalValue = Decimal.toDecimal(value, this.scale);
  }

  static toDecimal(val, scale) {
    const factor = 10 ** scale;
    return Math.round(val * factor) / factor;
  }
}

Usage:

const d = new Decimal(0, 4);
d.value = 0.1 + 0.2;              // 0.3
d.value = 0.3 - 0.2;              // 0.1
d.value = 0.1 + 0.2 - 0.3;        // 0
d.value = 5.551115123125783e-17;  // 0
d.value = 1 / 9;                  // 0.1111

Of course, when dealing with Decimal there are caveats:

d.value = 1/3 + 1/3 + 1/3;   // 1
d.value -= 1/3;              // 0.6667
d.value -= 1/3;              // 0.3334
d.value -= 1/3;              // 0.0001

You'd ideally want to use a high scale (like 12), and then convert it down when you need to present it or store it somewhere. Personally, I did experiment with creating a UInt8Array and trying to create a precision value (much like the SQL Decimal type), but since Javascript doesn't let you overload operators, it just gets a bit tedious not being able to use basic math operators (+, -, /, *) and using functions instead like add(), substract(), mult(). For my needs, it's not worth it.

But if you do need that level of precision and are willing to endure the use of functions for math, then I recommend the decimal.js library.

MySQL "incorrect string value" error when save unicode string in Django

I had the same problem and resolved it by changing the character set of the column. Even though your database has a default character set of utf-8 I think it's possible for database columns to have a different character set in MySQL. Here's the SQL QUERY I used:

    ALTER TABLE database.table MODIFY COLUMN col VARCHAR(255)
    CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL;

Select folder dialog WPF

Windows Presentation Foundation 4.5 Cookbook by Pavel Yosifovich on page 155 in the section on "Using the common dialog boxes" says:

"What about folder selection (instead of files)? The WPF OpenFileDialog does not support that. One solution is to use Windows Forms' FolderBrowseDialog class. Another good solution is to use the Windows API Code Pack described shortly."

I downloaded the API Code Pack from ~~Windows® API Code Pack for Microsoft® .NET Framework~~ Windows API Code Pack: Where is it?, then added references to Microsoft.WindowsAPICodePack.dll and Microsoft.WindowsAPICodePack.Shell.dll to my WPF 4.5 project.

Example:

using Microsoft.WindowsAPICodePack.Dialogs;

var dlg = new CommonOpenFileDialog();
dlg.Title = "My Title";
dlg.IsFolderPicker = true;
dlg.InitialDirectory = currentDirectory;

dlg.AddToMostRecentlyUsedList = false;
dlg.AllowNonFileSystemItems = false;
dlg.DefaultDirectory = currentDirectory;
dlg.EnsureFileExists = true;
dlg.EnsurePathExists = true;
dlg.EnsureReadOnly = false;
dlg.EnsureValidNames = true;
dlg.Multiselect = false;
dlg.ShowPlacesList = true;

if (dlg.ShowDialog() == CommonFileDialogResult.Ok) 
{
  var folder = dlg.FileName;
  // Do something with selected folder string
}

How to Fill an array from user input C#?

readline is for string.. just use read

How do I search for a pattern within a text file using Python combining regex & string/file operations and store instances of the pattern?

Doing it in one bulk read:

import re

textfile = open(filename, 'r')
filetext = textfile.read()
textfile.close()
matches = re.findall("(<(\d{4,5})>)?", filetext)

Line by line:

import re

textfile = open(filename, 'r')
matches = []
reg = re.compile("(<(\d{4,5})>)?")
for line in textfile:
    matches += reg.findall(line)
textfile.close()

But again, the matches that returns will not be useful for anything except counting unless you added an offset counter:

import re

textfile = open(filename, 'r')
matches = []
offset = 0
reg = re.compile("(<(\d{4,5})>)?")
for line in textfile:
    matches += [(reg.findall(line),offset)]
    offset += len(line)
textfile.close()

But it still just makes more sense to read the whole file in at once.

Calculating the SUM of (Quantity*Price) from 2 different tables

I had the same problem as Marko and come across a solution like this:

/*Create a Table*/
CREATE TABLE tableGrandTotal
(
columnGrandtotal int
)

/*Create a Stored Procedure*/
CREATE PROCEDURE GetGrandTotal
AS

/*Delete the 'tableGrandTotal' table for another usage of the stored procedure*/
DROP TABLE tableGrandTotal

/*Create a new Table which will include just one column*/
CREATE TABLE tableGrandTotal
(
columnGrandtotal int
)

/*Insert the query which returns subtotal for each orderitem row into tableGrandTotal*/
INSERT INTO tableGrandTotal
    SELECT oi.Quantity * p.Price AS columnGrandTotal
        FROM OrderItem oi
        JOIN Product p ON oi.Id = p.Id

/*And return the sum of columnGrandTotal from the newly created table*/    
SELECT SUM(columnGrandTotal) as [Grand Total]
    FROM tableGrandTotal

And just simply use the GetGrandTotal Stored Procedure to retrieve the Grand Total :)

EXEC GetGrandTotal

Qt 5.1.1: Application failed to start because platform plugin "windows" is missing

I found another solution. Create qt.conf in the app folder as such:

[Paths]
Prefix = .

And then copy the plugins folder into the app folder and it works for me.

How to determine if one array contains all elements of another array

If there are are no duplicate elements or you don't care about them, then you can use the Set class:

a1 = Set.new [5, 1, 6, 14, 2, 8]
a2 = Set.new [2, 6, 15]
a1.subset?(a2)
=> false

Behind the scenes this uses

all? { |o| set.include?(o) }

Moving Git repository content to another repository preserving history

I used the below method to migrate my GIT Stash to GitLab by maintaining all branches and commit history.

Clone the old repository to local.

git clone --bare <STASH-URL>

Create an empty repository in GitLab.

git push --mirror <GitLab-URL>

Powershell script does not run via Scheduled Tasks

I think the answer to this is relevant too:

Why is my Scheduled Task updating its 'Last Run Time' correctly, and giving a 'Last Run Result' of '(0x0)', but still not actually working?

Summary: Windows 2012 Scheduled Tasks do not see the correct environment variables, including PATH, for the account which the task is set to run as. But you can test for this, and if it is happening, and once you understand what is happening, you can work around it.

Write in body request with HttpClient

Extending your code (assuming that the XML you want to send is in xmlString) :

String xmlString = "</xml>";
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpRequest = new HttpPost(this.url);
httpRequest.setHeader("Content-Type", "application/xml");
StringEntity xmlEntity = new StringEntity(xmlString);
httpRequest.setEntity(xmlEntity );
HttpResponse httpresponse = httpclient.execute(httppost);

SELECT INTO a table variable in T-SQL

First create a temp table :

Step 1:

create table #tblOm_Temp (

    Name varchar(100),
    Age Int ,
    RollNumber bigint
)

**Step 2: ** Insert Some value in Temp table .

insert into #tblom_temp values('Om Pandey',102,1347)

Step 3: Declare a table Variable to hold temp table data.

declare   @tblOm_Variable table(

    Name Varchar(100),
    Age int,
    RollNumber bigint
)

Step 4: select value from temp table and insert into table variable.

insert into @tblOm_Variable select * from #tblom_temp

Finally value is inserted from a temp table to Table variable

Step 5: Can Check inserted value in table variable.

select * from @tblOm_Variable

How to read embedded resource text file

I read an embedded resource text file use:

    /// <summary>
    /// Converts to generic list a byte array
    /// </summary>
    /// <param name="content">byte array (embedded resource)</param>
    /// <returns>generic list of strings</returns>
    private List<string> GetLines(byte[] content)
    {
        string s = Encoding.Default.GetString(content, 0, content.Length - 1);
        return new List<string>(s.Split(new[] { Environment.NewLine }, StringSplitOptions.None));
    }

Sample:

var template = GetLines(Properties.Resources.LasTemplate /* resource name */);

template.ForEach(ln =>
{
    Debug.WriteLine(ln);
});

Multiple select in Visual Studio?

There is supposedly a way to do it now with Ctrl + Alt + Click but I use this extension because it has a bunch of other nice features that I use: https://marketplace.visualstudio.com/items?itemName=thomaswelen.SelectNextOccurrence

How do I add a .click() event to an image?

Enclose <img> in <a> tag.

<a href="http://www.google.com.pk"><img src="smiley.gif"></a>

it will open link on same tab, and if you want to open link on new tab then use target="_blank"

<a href="http://www.google.com.pk" target="_blank"><img src="smiley.gif"></a>

How do I 'foreach' through a two-dimensional array?

Using LINQ you can do it like this:

var table_enum = table

    // Convert to IEnumerable<string>
    .OfType<string>()

    // Create anonymous type where Index1 and Index2
    // reflect the indices of the 2-dim. array
    .Select((_string, _index) => new {
        Index1 = (_index / 2),
        Index2 = (_index % 2), // ? I added this only for completeness
        Value = _string
    })

    // Group by Index1, which generates IEnmurable<string> for all Index1 values
    .GroupBy(v => v.Index1)

    // Convert all Groups of anonymous type to String-Arrays
    .Select(group => group.Select(v => v.Value).ToArray());

// Now you can use the foreach-Loop as you planned
foreach(string[] str_arr in table_enum) {
    // …
}

This way it is also possible to use the foreach for looping through the columns instead of the rows by using Index2 in the GroupBy instead of Index 1. If you don't know the dimension of your array then you have to use the GetLength() method to determine the dimension and use that value in the quotient.

Adding an assets folder in Android Studio

An image of how to in Android Studio 1.5.1.

Within the "Android" project (see the drop-down in the topleft of my image), Right-click on the app...

Combine Points with lines with ggplot2

You may find that using the `group' aes will help you get the result you want. For example:

tu <- expand.grid(Land       = gl(2, 1, labels = c("DE", "BB")),
                  Altersgr   = gl(5, 1, labels = letters[1:5]),
                  Geschlecht = gl(2, 1, labels = c('m', 'w')),
                  Jahr       = 2000:2009)

set.seed(42)
tu$Wert <- unclass(tu$Altersgr) * 200 + rnorm(200, 0, 10)

ggplot(tu, aes(x = Jahr, y = Wert, color = Altersgr, group = Altersgr)) + 
  geom_point() + geom_line() + 
  facet_grid(Geschlecht ~ Land)

Which produces the plot found here:

enter image description here

Calling Member Functions within Main C++

On an informal note, you can also call non-static member functions on temporaries:

MyClass().printInformation();

(on another informal note, the end of the lifetime of the temporary variable (variable is important, because you can also call non-const member functions) comes at the end of the full expression (";"))

Deleting rows with MySQL LEFT JOIN

If you are using "table as", then specify it to delete.

In the example i delete all table_1 rows which are do not exists in table_2.

DELETE t1 FROM `table_1` t1 LEFT JOIN `table_2` t2 ON t1.`id` = t2.`id` WHERE t2.`id` IS NULL

Select 50 items from list at random to write to file

Say your list has 100 elements and you want to pick 50 of them in a random way. Here are the steps to follow:

Import the libraries
Create the seed for random number generator, I have put it at 2
Prepare a list of numbers from which to pick up in a random way
Make the random choices from the numbers list

Code:

from random import seed
from random import choice

seed(2)
numbers = [i for i in range(100)]

print(numbers)

for _ in range(50):
    selection = choice(numbers)
    print(selection)

DynamoDB vs MongoDB NoSQL

Bear in mind, I've only experimented with MongoDB...

From what I've read, DynamoDB has come a long way in terms of features. It used to be a super-basic key-value store with extremely limited storage and querying capabilities. It has since grown, now supporting bigger document sizes + JSON support and global secondary indices. The gap between what DynamoDB and MongoDB offers in terms of features grows smaller with every month. The new features of DynamoDB are expanded on here.

Much of the MongoDB vs. DynamoDB comparisons are out of date due to the recent addition of DynamoDB features. However, this post offers some other convincing points to choose DynamoDB, namely that it's simple, low maintenance, and often low cost. Another discussion here of database choices was interesting to read, though slightly old.

My takeaway: if you're doing serious database queries or working in languages not supported by DynamoDB, use MongoDB. Otherwise, stick with DynamoDB.

How to get single value of List<object>

Define a class like this :

public class myclass {
       string id ;
       string title ;
       string content;
 }

 public class program {
        public void Main () {
               List<myclass> objlist = new List<myclass> () ;
               foreach (var value in objlist)  {
                       TextBox1.Text = value.id ;
                       TextBox2.Text= value.title;
                       TextBox3.Text= value.content ;
                }
         }
  }

I tried to draw a sketch and you can improve it in many ways. Instead of defining class "myclass", you can define struct.

PHP - find entry by object property from an array of objects

YurkamTim is right. It needs only a modification:

After function($) you need a pointer to the external variable by "use(&$searchedValue)" and then you can access the external variable. Also you can modify it.

$neededObject = array_filter(
    $arrayOfObjects,
    function ($e) use (&$searchedValue) {
        return $e->id == $searchedValue;
    }
);

How to Programmatically Add Views to Views

You guys should also make sure that when you override onLayout you HAVE to call super.onLayout with all of the properties, or the view will not be inflated!

What exactly are iterator, iterable, and iteration?

Here's the explanation I use in teaching Python classes:

An ITERABLE is:

anything that can be looped over (i.e. you can loop over a string or file) or
anything that can appear on the right-side of a for-loop: for x in iterable: ... or
anything you can call with iter() that will return an ITERATOR: iter(obj) or
an object that defines __iter__ that returns a fresh ITERATOR, or it may have a __getitem__ method suitable for indexed lookup.

An ITERATOR is an object:

with state that remembers where it is during iteration,
with a __next__ method that:
- returns the next value in the iteration
- updates the state to point at the next value
- signals when it is done by raising StopIteration
and that is self-iterable (meaning that it has an __iter__ method that returns self).

Notes:

The __next__ method in Python 3 is spelt next in Python 2, and
The builtin function next() calls that method on the object passed to it.

For example:

>>> s = 'cat'      # s is an ITERABLE
                   # s is a str object that is immutable
                   # s has no state
                   # s has a __getitem__() method 

>>> t = iter(s)    # t is an ITERATOR
                   # t has state (it starts by pointing at the "c"
                   # t has a next() method and an __iter__() method

>>> next(t)        # the next() function returns the next value and advances the state
'c'
>>> next(t)        # the next() function returns the next value and advances
'a'
>>> next(t)        # the next() function returns the next value and advances
't'
>>> next(t)        # next() raises StopIteration to signal that iteration is complete
Traceback (most recent call last):
...
StopIteration

>>> iter(t) is t   # the iterator is self-iterable

The most efficient way to implement an integer based power function pow(int, int)

Late to the party:

Below is a solution that also deals with y < 0 as best as it can.

It uses a result of intmax_t for maximum range. There is no provision for answers that do not fit in intmax_t.
powjii(0, 0) --> 1 which is a common result for this case.

pow(0,negative), another undefined result, returns INTMAX_MAX

intmax_t powjii(int x, int y) {
  if (y < 0) {
    switch (x) {
      case 0:
        return INTMAX_MAX;
      case 1:
        return 1;
      case -1:
        return y % 2 ? -1 : 1;
    }
    return 0;
  }
  intmax_t z = 1;
  intmax_t base = x;
  for (;;) {
    if (y % 2) {
      z *= base;
    }
    y /= 2;
    if (y == 0) {
      break; 
    }
    base *= base;
  }
  return z;
}

This code uses a forever loop for(;;) to avoid the final base *= base common in other looped solutions. That multiplication is 1) not needed and 2) could be int*int overflow which is UB.

How to check if element in groovy array/hash/collection/list?

You can also use matches with regular expression like this:

boolean bool = List.matches("(?i).*SOME STRING HERE.*")

Rename master branch for both local and remote Git repositories

git checkout -b new-branch-name
git push remote-name new-branch-name :old-branch-name

You may have to manually switch to new-branch-name before deleting old-branch-name

C++: Rounding up to the nearest multiple of a number

int roundUp (int numToRound, int multiple)
{
  return multiple * ((numToRound + multiple - 1) / multiple);
}

although:

won't work for negative numbers
won't work if numRound + multiple overflows

would suggest using unsigned integers instead, which has defined overflow behaviour.

You'll get an exception is multiple == 0, but it isn't a well-defined problem in that case anyway.

Sending multipart/formdata with jQuery.ajax

Older versions of IE do not support FormData ( Full browser support list for FormData is here: https://developer.mozilla.org/en-US/docs/Web/API/FormData).

Either you can use a jquery plugin (For ex, http://malsup.com/jquery/form/#code-samples ) or, you can use IFrame based solution to post multipart form data through ajax: https://developer.mozilla.org/en-US/docs/Learn/HTML/Forms/Sending_forms_through_JavaScript

Delete all but the most recent X files in bash

ls -tQ | tail -n+4 | xargs rm

List filenames by modification time, quoting each filename. Exclude first 3 (3 most recent). Remove remaining.

EDIT after helpful comment from mklement0 (thanks!): corrected -n+3 argument, and note this will not work as expected if filenames contain newlines and/or the directory contains subdirectories.

Why do I get an error instantiating an interface?

You cannot instantiate an abstract class or interface. You must inherit it, if its an abstract class, or implement it if it's an interface. e.g.

...
private class User : IUser
{
  ...
}

User u = new User();

$(document).click() not working correctly on iPhone. jquery

Adding in the following code works.

The problem is iPhones dont raise click events. They raise "touch" events. Thanks very much apple. Why couldn't they just keep it standard like everyone else? Anyway thanks Nico for the tip.

Credit to: http://ross.posterous.com/2008/08/19/iphone-touch-events-in-javascript

$(document).ready(function () {
  init();
  $(document).click(function (e) {
    fire(e);
  });
});

function fire(e) { alert('hi'); }

function touchHandler(event)
{
    var touches = event.changedTouches,
        first = touches[0],
        type = "";

    switch(event.type)
    {
       case "touchstart": type = "mousedown"; break;
       case "touchmove":  type = "mousemove"; break;        
       case "touchend":   type = "mouseup"; break;
       default: return;
    }

    //initMouseEvent(type, canBubble, cancelable, view, clickCount, 
    //           screenX, screenY, clientX, clientY, ctrlKey, 
    //           altKey, shiftKey, metaKey, button, relatedTarget);

    var simulatedEvent = document.createEvent("MouseEvent");
    simulatedEvent.initMouseEvent(type, true, true, window, 1, 
                          first.screenX, first.screenY, 
                          first.clientX, first.clientY, false, 
                          false, false, false, 0/*left*/, null);

    first.target.dispatchEvent(simulatedEvent);
    event.preventDefault();
}

function init() 
{
    document.addEventListener("touchstart", touchHandler, true);
    document.addEventListener("touchmove", touchHandler, true);
    document.addEventListener("touchend", touchHandler, true);
    document.addEventListener("touchcancel", touchHandler, true);    
}

Initializing a struct to 0

If the data is a static or global variable, it is zero-filled by default, so just declare it myStruct _m;

If the data is a local variable or a heap-allocated zone, clear it with memset like:

memset(&m, 0, sizeof(myStruct));

Current compilers (e.g. recent versions of gcc) optimize that quite well in practice. This works only if all zero values (include null pointers and floating point zero) are represented as all zero bits, which is true on all platforms I know about (but the C standard permits implementations where this is false; I know no such implementation).

You could perhaps code myStruct m = {}; or myStruct m = {0}; (even if the first member of myStruct is not a scalar).

My feeling is that using memset for local structures is the best, and it conveys better the fact that at runtime, something has to be done (while usually, global and static data can be understood as initialized at compile time, without any cost at runtime).

Creating a thumbnail from an uploaded image

<?php 
error_reporting(0);

$change="";
$abc="";


 define ("MAX_SIZE","4000");
 function getExtension($str) {
         $i = strrpos($str,".");
         if (!$i) { return ""; }
         $l = strlen($str) - $i;
         $ext = substr($str,$i+1,$l);
         return $ext;
 }

 $errors=0;

 if($_SERVER["REQUEST_METHOD"] == "POST")
 {
    $image =$_FILES["file"]["name"];
    $uploadedfile = $_FILES['file']['tmp_name'];


    if ($image) 
    {

        $filename = stripslashes($_FILES['file']['name']);

        $extension = getExtension($filename);
        $extension = strtolower($extension);


 if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif")) 
        {

            $change='<div class="msgdiv">Unknown Image extension </div> ';
            $errors=1;
        }
        else
        {

 $size=filesize($_FILES['file']['tmp_name']);


if ($size > MAX_SIZE*1024)
{
    $change='<div class="msgdiv">You have exceeded the size limit!</div> ';
    $errors=1;
}


if($extension=="jpg" || $extension=="jpeg" )
{
$uploadedfile = $_FILES['file']['tmp_name'];
$src = imagecreatefromjpeg($uploadedfile);

}
else if($extension=="png")
{
$uploadedfile = $_FILES['file']['tmp_name'];
$src = imagecreatefrompng($uploadedfile);

}
else 
{
$src = imagecreatefromgif($uploadedfile);
}

echo $scr;

list($width,$height)=getimagesize($uploadedfile);


$newwidth=45;
$newheight=45;
$tmp=imagecreatetruecolor($newwidth,$newheight);


$newwidth1=90;
$newheight1=90;
$tmp1=imagecreatetruecolor($newwidth1,$newheight1);

$tmp2=imagecreatetruecolor($width,$height);
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);

imagecopyresampled($tmp1,$src,0,0,0,0,$newwidth1,$newheight1,$width,$height);

imagecopyresampled($tmp2,$src,0,0,0,0,$width,$height,$width,$height);

$filename = "images/1-". $_FILES['file']['name']=time();

$filename1 = "images/2-". $_FILES['file']['name']=time();

$filename2 = "images/3-". $_FILES['file']['name']=time();

imagejpeg($tmp,$filename,100);

imagejpeg($tmp1,$filename1,100);

imagejpeg($tmp2,$filename2,100);

imagedestroy($src);
imagedestroy($tmp);
imagedestroy($tmp1);
}}

}
 if(isset($_POST['Submit']) && !$errors) 
 {

   // mysql_query("update {$prefix}users set img='$big',img_small='$small' where user_id='$user'");
    $change=' <div class="msgdiv">Image Uploaded Successfully!</div>';
 }

?>
<html xml:lang="en" xmlns="http://www.w3.org/1999/xhtml" lang="en"><head>
    <title>picture demo</title>

   <link href=".css" media="screen, projection" rel="stylesheet" type="text/css">
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.0/jquery.min.js"></script>
<script type="text/javascript" src="js/jquery_002.js"></script>
<script type="text/javascript" src="js/displaymsg.js"></script>
<script type="text/javascript" src="js/ajaxdelete.js"></script>


  <style type="text/css">
  .help
{
font-size:11px; color:#006600;
}
body {
     color: #000000;
 background-color:#999999 ;
    background:#999999 url(<?php echo $user_row['img_src']; ?>) fixed repeat top left;


    font-family:"Lucida Grande", "Lucida Sans Unicode", Verdana, Arial, Helvetica, sans-serif; 

    }
        .msgdiv{
    width:759px;
padding-top:8px;
padding-bottom:8px;
background-color: #fff;
font-weight:bold;
font-size:18px;-moz-border-radius: 6px;-webkit-border-radius: 6px;
}
#container{width:763px;margin:0 auto;padding:3px 0;text-align:left;position:relative; -moz-border-radius: 6px;-webkit-border-radius: 6px; background-color:#FFFFFF }
</style>

  </head><body>
     <div align="center" id="err">
<?php echo $change; ?>  </div>
   <div id="space"></div>





  <div id="container" >

   <div id="con">



        <table width="502" cellpadding="0" cellspacing="0" id="main">
          <tbody>
            <tr>
              <td width="500" height="238" valign="top" id="main_right">

              <div id="posts">
              &nbsp;&nbsp;&nbsp;&nbsp;<img src="<?php// echo $filename; ?>" />  &nbsp;&nbsp;&nbsp;&nbsp;<img src="<?php// echo $filename1; ?>"  />
                <form method="post" action="" enctype="multipart/form-data" name="form1">
                <table width="500" border="0" align="center" cellpadding="0" cellspacing="0">
               <tr><Td style="height:25px">&nbsp;</Td></tr>
        <tr>
          <td width="150"><div align="right" class="titles">Picture 
            : </div></td>
          <td width="350" align="left">
            <div align="left">
              <input size="25" name="file" type="file" style="font-family:Verdana, Arial, Helvetica, sans-serif; font-size:10pt" class="box"/>

              </div></td>

        </tr>
        <tr><Td></Td>
        <Td valign="top" height="35px" class="help">Image maximum size <b>4000 </b>kb</span></Td>
        </tr>
        <tr><Td></Td><Td valign="top" height="35px"><input type="submit" id="mybut" value="       Upload        " name="Submit"/></Td></tr>
        <tr>
          <td width="200">&nbsp;</td>
          <td width="200"><table width="200" border="0" cellspacing="0" cellpadding="0">
              <tr>
                <td width="200" align="center"><div align="left"></div></td>
                <td width="100">&nbsp;</td>
              </tr>
          </table></td>
        </tr>
      </table>
    </form>
 </div>
            </td>

        </tr>
          </tbody>
     </table>
   </div>

  </div>



</body></html>

Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/JDBC_DBO]]

To resolve this issue, you have to delete the .snap file located in the directory:

<workspace-directory>\.metadata\.plugins\org.eclipse.core.resources.

After deleting this file, you could start Eclipse with no problem.

PHP - get base64 img string decode and save as jpg (resulting empty image )

Client need to send base64 to server.

And above answer described code is work perfectly:

$imageData = base64_decode($imageData);
$source = imagecreatefromstring($imageData);
$rotate = imagerotate($source, $angle, 0); // if want to rotate the image
$imageSave = imagejpeg($rotate,$imageName,100);
imagedestroy($source);

Thanks

Install Visual Studio 2013 on Windows 7

your log files shows it is stopping on error "0x8004C000"

From MS Website (http://social.technet.microsoft.com/wiki/contents/articles/15716.visual-studio-2012-and-the-error-code-2147205120.aspx):

Setup Status
Block

Restart not required
0x80044000 [-2147205120]

Restart required
0x8004C000 [-2147172352]

Description
If the only block to be reported is “Reboot Pending,” the returned value is the Incomplete-Reboot Required value (0x80048bc7).

Assigning default value while creating migration file

Yes, I couldn't see how to use 'default' in the migration generator command either but was able to specify a default value for a new string column as follows by amending the generated migration file before applying "rake db:migrate":

class AddColumnToWidgets < ActiveRecord::Migration
  def change
    add_column :widgets, :colour, :string, default: 'red'
  end
end

This adds a new column called 'colour' to my 'Widget' model and sets the default 'colour' of new widgets to 'red'.

How to Maximize window in chrome using webDriver (python)

For MAC or Linux:

ChromeOptions chromeOptions = new ChromeOptions();
chromeOptions.addArguments("--kiosk");
driver = new ChromeDriver(chromeOptions);

For Windows:

ChromeOptions chromeOptions = new ChromeOptions();
chromeOptions.addArguments("--start-maximized");
driver = new ChromeDriver(chromeOptions);

operator << must take exactly one argument

I ran into this problem with templated classes. Here's a more general solution I had to use:

template class <T>
class myClass
{
    int myField;

    // Helper function accessing my fields
    void toString(std::ostream&) const;

    // Friend means operator<< can use private variables
    // It needs to be declared as a template, but T is taken
    template <class U>
    friend std::ostream& operator<<(std::ostream&, const myClass<U> &);
}

// Operator is a non-member and global, so it's not myClass<U>::operator<<()
// Because of how C++ implements templates the function must be
// fully declared in the header for the linker to resolve it :(
template <class U>
std::ostream& operator<<(std::ostream& os, const myClass<U> & obj)
{
  obj.toString(os);
  return os;
}

Now: * My toString() function can't be inline if it is going to be tucked away in cpp. * You're stuck with some code in the header, I couldn't get rid of it. * The operator will call the toString() method, it's not inlined.

The body of operator<< can be declared in the friend clause or outside the class. Both options are ugly. :(

Maybe I'm misunderstanding or missing something, but just forward-declaring the operator template doesn't link in gcc.

This works too:

template class <T>
class myClass
{
    int myField;

    // Helper function accessing my fields
    void toString(std::ostream&) const;

    // For some reason this requires using T, and not U as above
    friend std::ostream& operator<<(std::ostream&, const myClass<T> &)
    {
        obj.toString(os);
        return os;
    }
}

I think you can also avoid the templating issues forcing declarations in headers, if you use a parent class that is not templated to implement operator<<, and use a virtual toString() method.

How to detect installed version of MS-Office?

Despite the fact that this question has been answered long time ago, I found some interesting facts to add that are related to the answers above.

As Dirk mentioned, there seems to be a weird fashion of version control from MS, starting from Office 365 / 2019. You cannot distinguish among the three(2016, 2019, O365), by seeing at the executable paths anymore. And just like he reputed himself, looking at the builds of the executable, as a mean of telling which is what, isn't quite effective either.

After some researching, I found a feasible solution. The solution lies under the registry subkey Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Licensing\LicensingNext.

So, my logic follows below:

Case 1: If the computer has the MSOffice 2016 installed, there is no subkeys under Licensing.

Case 2: if the computer has MSOffice 2019 installed, there is the name of the value (which is one of the Office Product ID). (e.g. Standard2019Volume)

Case 3: if the computer has Office365 installed, there is a value called o365bussinessretail(which is also a product ID) along with some other values.

The possible productIds are provided here.

To distinguish the three, I just opened the key and see if fails. If the open fails, its Office 2016. Then I enumerate LicensingNext and try to see if any name has a prefix o365, if it finds it then its O365. If it does not, then its Office 2019.

Frankly speaking, I did not have enough time to test the logic under varying environment. So please, note that.

Hope this will help whoever's interest.

Height of status bar in Android

Since multi-window mode is available now, your app may not have statusbar on top.

Following solution handle all the cases automatically for you.

android:fitsSystemWindows="true"

or programatically

findViewById(R.id.your_root_view).setFitsSystemWindows(true);

you may also get root view by

findViewById(android.R.id.content).getRootView();
or
getWindow().getDecorView().findViewById(android.R.id.content)

For more details on getting root-view refer - https://stackoverflow.com/a/4488149/9640177

How do you keep parents of floated elements from collapsing?

The main problem you may find with changing overflow to auto or hidden is that everything can become scrollable with the middle mouse buttom and a user can mess up the entire site layout.

What does this GCC error "... relocation truncated to fit..." mean?

I ran into the exact same issue. After compiling without the -fexceptions build flag, the file compiled with no issue

Why is sed not recognizing \t as a tab?

@sedit was on the right path, but it's a bit awkward to define a variable.

Solution (bash specific)

The way to do this in bash is to put a dollar sign in front of your single quoted string.

$ echo -e '1\n2\n3'
1
2
3

$ echo -e '1\n2\n3' | sed 's/.*/\t&/g'
t1
t2
t3

$ echo -e '1\n2\n3' | sed $'s/.*/\t&/g'
    1
    2
    3

If your string needs to include variable expansion, you can put quoted strings together like so:

$ timestamp=$(date +%s)
$ echo -e '1\n2\n3' | sed "s/.*/$timestamp"$'\t&/g'
1491237958  1
1491237958  2
1491237958  3

Explanation

In bash $'string' causes "ANSI-C expansion". And that is what most of us expect when we use things like \t, \r, \n, etc. From: https://www.gnu.org/software/bash/manual/html_node/ANSI_002dC-Quoting.html#ANSI_002dC-Quoting

Words of the form $'string' are treated specially. The word expands to string, with backslash-escaped characters replaced as specified by the ANSI C standard. Backslash escape sequences, if present, are decoded...

The expanded result is single-quoted, as if the dollar sign had not been present.

Solution (if you must avoid bash)

I personally think most efforts to avoid bash are silly because avoiding bashisms does NOT* make your code portable. (Your code will be less brittle if you shebang it to bash -eu than if you try to avoid bash and use sh [unless you are an absolute POSIX ninja].) But rather than have a religious argument about that, I'll just give you the BEST* answer.

$ echo -e '1\n2\n3' | sed "s/.*/$(printf '\t')&/g"
    1
    2
    3

* BEST answer? Yes, because one example of what most anti-bash shell scripters would do wrong in their code is use echo '\t' as in @robrecord's answer. That will work for GNU echo, but not BSD echo. That is explained by The Open Group at http://pubs.opengroup.org/onlinepubs/9699919799/utilities/echo.html#tag_20_37_16 And this is an example of why trying to avoid bashisms usually fail.

How to get previous month and year relative to today, using strtotime and date?

function getOnemonthBefore($date){
    $day = intval(date("t", strtotime("$date")));//get the last day of the month
    $month_date = date("y-m-d",strtotime("$date -$day days"));//get the day 1 month before
    return $month_date;
}

The resulting date is dependent to the number of days the input month is consist of. If input month is february (28 days), 28 days before february 5 is january 8. If input is may 17, 31 days before is april 16. Likewise, if input is may 31, resulting date will be april 30.

NOTE: the input takes complete date ('y-m-d') and outputs ('y-m-d') you can modify this code to suit your needs.

How do you use bcrypt for hashing passwords in PHP?

Version 5.5 of PHP will have built-in support for BCrypt, the functions password_hash() and password_verify(). Actually these are just wrappers around the function crypt(), and shall make it easier to use it correctly. It takes care of the generation of a safe random salt, and provides good default values.

The easiest way to use this functions will be:

$hashToStoreInDb = password_hash($password, PASSWORD_BCRYPT);
$isPasswordCorrect = password_verify($password, $existingHashFromDb);

This code will hash the password with BCrypt (algorithm 2y), generates a random salt from the OS random source, and uses the default cost parameter (at the moment this is 10). The second line checks, if the user entered password matches an already stored hash-value.

Should you want to change the cost parameter, you can do it like this, increasing the cost parameter by 1, doubles the needed time to calculate the hash value:

$hash = password_hash($password, PASSWORD_BCRYPT, array("cost" => 11));

In contrast to the "cost" parameter, it is best to omit the "salt" parameter, because the function already does its best to create a cryptographically safe salt.

For PHP version 5.3.7 and later, there exists a compatibility pack, from the same author that made the password_hash() function. For PHP versions before 5.3.7 there is no support for crypt() with 2y, the unicode safe BCrypt algorithm. One could replace it instead with 2a, which is the best alternative for earlier PHP versions.

How to change the name of a Django app?

Follow these steps to change an app's name in Django:

Rename the folder which is in your project root
Change any references to your app in their dependencies, i.e. the app's views.py, urls.py , 'manage.py' , and settings.py files.
Edit the database table django_content_type with the following command: UPDATE django_content_type SET app_label='<NewAppName>' WHERE app_label='<OldAppName>'
Also if you have models, you will have to rename the model tables. For postgres use ALTER TABLE <oldAppName>_modelName RENAME TO <newAppName>_modelName. For mysql too I think it is the same (as mentioned by @null_radix)
(For Django >= 1.7) Update the django_migrations table to avoid having your previous migrations re-run: UPDATE django_migrations SET app='<NewAppName>' WHERE app='<OldAppName>'. Note: there is some debate (in comments) if this step is required for Django 1.8+; If someone knows for sure please update here.
If your models.py 's Meta Class has app_name listed, make sure to rename that too (mentioned by @will).
If you've namespaced your static or templates folders inside your app, you'll also need to rename those. For example, rename old_app/static/old_app to new_app/static/new_app.
For renaming django models, you'll need to change django_content_type.name entry in DB. For postgreSQL use UPDATE django_content_type SET name='<newModelName>' where name='<oldModelName>' AND app_label='<OldAppName>'

Meta point (If using virtualenv): Worth noting, if you are renaming the directory that contains your virtualenv, there will likely be several files in your env that contain an absolute path and will also need to be updated. If you are getting errors such as ImportError: No module named ... this might be the culprit. (thanks to @danyamachine for providing this).

Other references: you might also want to refer the below links for a more complete picture

Renaming an app with Django and South
How do I migrate a model out of one django app and into a new one?
How to change the name of a Django app?
Backwards migration with Django South
Easiest way to rename a model using Django/South?
Python code (thanks to A.Raouf) to automate the above steps (Untested code. You have been warned!)
Python code (thanks to rafaponieman) to automate the above steps (Untested code. You have been warned!)

How to import load a .sql or .csv file into SQLite?

The sqlite3 .import command won't work for ordinary csv data because it treats any comma as a delimiter even in a quoted string.

This includes trying to re-import a csv file that was created by the shell:

Create table T (F1 integer, F2 varchar);
Insert into T values (1, 'Hey!');
Insert into T values (2, 'Hey, You!');

.mode csv
.output test.csv
select * from T;

Contents of test.csv:
1,Hey!
2,"Hey, You!"

delete from T;

.import test.csv T
Error: test.csv line 2: expected 2 columns of data but found 3

It seems we must transform the csv into a list of Insert statements, or perhaps a different delimiter will work.

Over at SuperUser I saw a suggestion to use LogParser to deal with csv files, I'm going to look into that.

ServletException, HttpServletResponse and HttpServletRequest cannot be resolved to a type

Are the classes imported? Try pressing CTRL + SHIFT + O to resolve the imports. If this does not work you need to include the application servers runtime libraries.

Windows > Preferences
Server > Runtime Environment
Add
Select your appropriate environment, click Next
Point to the install directory and click Finish.

enter image description here

Sending a file over TCP sockets in Python

Remove below code

s.send("Hello server!")

because your sending s.send("Hello server!") to server, so your output file is somewhat more in size.

How do I get the offset().top value of an element without using jQuery?

You can try element[0].scrollTop, in my opinion this solution is faster.

Here you have bigger example - http://cvmlrobotics.blogspot.de/2013/03/angularjs-get-element-offset-position.html

How to open a link in new tab using angular?

you can try binding property whit route

in your component.ts user:any = 'linkABC';

in your component.html <a target="_blank" href="yourtab/{{user}}">new tab </a>

A beginner's guide to SQL database design

It's been a while since I read it (so, I'm not sure how much of it is still relevant), but my recollection is that Joe Celko's SQL for Smarties book provides a lot of info on writing elegant, effective, and efficient queries.

Add more than one parameter in Twig path

Consider making your route:

_files_manage:
    pattern: /files/management/{project}/{user}
    defaults: { _controller: AcmeTestBundle:File:manage }

since they are required fields. It will make your url's prettier, and be a bit easier to manage.

Your Controller would then look like

 public function projectAction($project, $user)

How do I print an IFrame from javascript in Safari/Chrome

In addition to Andrew's and Max's solutions, using iframe.focus() resulted in printing parent frame instead of printing only child iframe in IE8. Changing that line fixed it:

function printIframe(id)
{
    var iframe = document.frames ? document.frames[id] : document.getElementById(id);
    var ifWin = iframe.contentWindow || iframe;
    ifWin.focus();
    ifWin.printPage();
    return false;
}

How to disable Excel's automatic cell reference change after copy/paste?

From http://spreadsheetpage.com/index.php/tip/making_an_exact_copy_of_a_range_of_formulas_take_2:

Put Excel in formula view mode. The easiest way to do this is to press Ctrl+` (that character is a "backwards apostrophe," and is usually on the same key that has the ~ (tilde).
Select the range to copy.
Press Ctrl+C
Start Windows Notepad
Press Ctrl+V to past the copied data into Notepad
In Notepad, press Ctrl+A followed by Ctrl+C to copy the text
Activate Excel and activate the upper left cell where you want to paste the formulas. And, make sure that the sheet you are copying to is in formula view mode.
Press Ctrl+V to paste.
Press Ctrl+` to toggle out of formula view mode.

Note: If the paste operation back to Excel doesn't work correctly, chances are that you've used Excel's Text-to-Columns feature recently, and Excel is trying to be helpful by remembering how you last parsed your data. You need to fire up the Convert Text to Columns Wizard. Choose the Delimited option and click Next. Clear all of the Delimiter option checkmarks except Tab.

Or, from http://spreadsheetpage.com/index.php/tip/making_an_exact_copy_of_a_range_of_formulas/:

If you're a VBA programmer, you can simply execute the following code: 
With Sheets("Sheet1")
 .Range("A11:D20").Formula = .Range("A1:D10").Formula
End With

NoClassDefFoundError in Java: com/google/common/base/Function

you don't have the "google-collections" library on your classpath.

There are a number of ways to add libraries to your classpath, so please provide more info regarding how you are executing your program.

if from the command line, you can add libraries to the classpath via

java -classpath path/lib.jar ...

javascript remove "disabled" attribute from html input

Best answer is just removeAttribute

element.removeAttribute("disabled");

Schema validation failed with the following errors: Data path ".builders['app-shell']" should have required property 'class'

Just found this answer from another link,

npm uninstall @angular-devkit/build-angular
npm install @angular-devkit/[email protected]

Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.12:test (default-test) on project.

Just add those below line in pom.xml file on the top of <modelversion> tag:

<repositories>
  <repository>
    <id>central</id>
    <name>Central Repository</name>
    <url>http://repo.maven.apache.org/maven2</url>
    <layout>default</layout>
    <snapshots>
      <enabled>false</enabled>
    </snapshots>
  </repository>
</repositories>

How to launch jQuery Fancybox on page load?

Maybe this will help... this was used in the full size jQuery calendar click event (http://arshaw.com/fullcalendar/)... but it can be used more generally to deal with fancybox being launched by jQuery.

  eventClick: function(calEvent, jsEvent, view) {
      jQuery("body").after('<a id="link_'+calEvent.url+'" style="display: hidden;" href="http://thisweekinblackness.com/wp-content/uploads/2009/01/steve-urkel.jpg">Steve</a>');
      jQuery('#link_'+calEvent.url).fancybox(); 
      jQuery('#link_'+calEvent.url).click();
      jQuery('#link_'+calEvent.url).remove();
    return false;
  }

How to get a list of programs running with nohup

You cannot exactly get a list of commands started with nohup but you can see them along with your other processes by using the command ps x. Commands started with nohup will have a question mark in the TTY column.

Calculate RSA key fingerprint

On Fedora I do locate ~/.ssh which tells me keys are at

/root/.ssh
/root/.ssh/authorized_keys

Initializing a dictionary in python with a key value and no corresponding values

Use the fromkeys function to initialize a dictionary with any default value. In your case, you will initialize with None since you don't have a default value in mind.

empty_dict = dict.fromkeys(['apple','ball'])

this will initialize empty_dict as:

empty_dict = {'apple': None, 'ball': None}

As an alternative, if you wanted to initialize the dictionary with some default value other than None, you can do:

default_value = 'xyz'
nonempty_dict = dict.fromkeys(['apple','ball'],default_value)

Installing Git on Eclipse

There are two ways of installing the Git plugin in Eclipse

Installing through Help -> Install New Software..., then add the location http://download.eclipse.org/egit/updates/
Installing through Help -> Eclipse Marketplace..., then type Egit and installing it.

Both methods may need you to restart Eclipse in the middle. For the step by step guide on installing and configuring Git plugin in Eclipse, you can also refer to Install and configure git plugin in Eclipse

Cannot implicitly convert type 'int' to 'short'

For some strange reason, you can use the += operator to add shorts.

short answer = 0;
short firstNo = 1;
short secondNo = 2;

answer += firstNo;
answer += secondNo;

PhoneGap Eclipse Issue - eglCodecCommon glUtilsParamSize: unknow param errors

For those who like to work close to the metal, here is a command that will clear out the unwanted soot, without needing any special tools or scripts:

adb logcat "eglCodecCommon:S"

How can I scale an image in a CSS sprite

Easy... Using two copies of same image with different scale on the sprite's sheet. Set the Coords and size on the app's logic.

How to get data from observable in angular2

this.myService.getConfig().subscribe(
  (res) => console.log(res),
  (err) => console.log(err),
  () => console.log('done!')
);

How can I wait for set of asynchronous callback functions?

You can emulate it like this:

  countDownLatch = {
     count: 0,
     check: function() {
         this.count--;
         if (this.count == 0) this.calculate();
     },
     calculate: function() {...}
  };

then each async call does this:

countDownLatch.count++;

while in each asynch call back at the end of the method you add this line:

countDownLatch.check();

In other words, you emulate a count-down-latch functionality.

Add to Array jQuery

push is a native javascript method. You could use it like this:

var array = [1, 2, 3];
array.push(4); // array now is [1, 2, 3, 4]
array.push(5, 6, 7); // array now is [1, 2, 3, 4, 5, 6, 7]

Set NOW() as Default Value for datetime datatype?

My solution

ALTER TABLE `table_name` MODIFY COLUMN `column_name` TIMESTAMP NOT
NULL DEFAULT CURRENT_TIMESTAMP;

Find Number of CPUs and Cores per CPU using Command Prompt

If you want to find how many processors (or CPUs) a machine has the same way %NUMBER_OF_PROCESSORS% shows you the number of cores, save the following script in a batch file, for example, GetNumberOfCores.cmd:

@echo off
for /f "tokens=*" %%f in ('wmic cpu get NumberOfCores /value ^| find "="') do set %%f

And then execute like this:

GetNumberOfCores.cmd

echo %NumberOfCores%

The script will set a environment variable named %NumberOfCores% and it will contain the number of processors.

How to check if AlarmManager already has an alarm set?

For others who may need this, here's an answer.

Use adb shell dumpsys alarm

You can know the alarm has been set and when are they going to alarmed and interval. Also how many times this alarm has been invoked.

Getting the docstring from a function

You can also use inspect.getdoc. It cleans up the __doc__ by normalizing tabs to spaces and left shifting the doc body to remove common leading spaces.

Using atan2 to find angle between two vectors

As a complement to the answer of @martin-r one should note that it is possible to use the sum/difference formula for arcus tangens.

angle = atan2(vec2.y, vec2.x) - atan2(vec1.y, vec1.x);
angle = -atan2(vec1.x * vec2.y - vec1.y * vec2.x, dot(vec1, vec2))
        where dot = vec1.x * vec2.x  + vec1.y * vec2.y

Caveat 1: make sure the angle remains within -pi ... +pi
Caveat 2: beware when the vectors are getting very similar, you might get extinction in the first argument, leading to numerical inaccuracies

How to execute .sql script file using JDBC

I had the same problem trying to execute an SQL script that creates an SQL database. Googling here and there I found a Java class initially written by Clinton Begin which supports comments (see http://pastebin.com/P14HsYAG). I modified slightly the file to cater for triggers where one has to change the default DELIMITER to something different. I've used that version ScriptRunner (see http://pastebin.com/sb4bMbVv). Since an (open source and free) SQLScriptRunner class is an absolutely necessary utility, it would be good to have some more input from developers and hopefully we'll have soon a more stable version of it.

Cannot delete directory with Directory.Delete(path, true)

add true in the second param.

Directory.Delete(path, true);

It will remove all.

Android webview & localStorage

The following was missing:

settings.setDomStorageEnabled(true);

PHP check if file is an image

Native way to get the mimetype:

For PHP < 5.3 use mime_content_type()
For PHP >= 5.3 use finfo_open() or mime_content_type()

Alternatives to get the MimeType are exif_imagetype and getimagesize, but these rely on having the appropriate libs installed. In addition, they will likely just return image mimetypes, instead of the whole list given in magic.mime.

While mime_content_type is available from PHP 4.3 and is part of the FileInfo extension (which is enabled by default since PHP 5.3, except for Windows platforms, where it must be enabled manually, for details see here).

If you don't want to bother about what is available on your system, just wrap all four functions into a proxy method that delegates the function call to whatever is available, e.g.

function getMimeType($filename)
{
    $mimetype = false;
    if(function_exists('finfo_open')) {
        // open with FileInfo
    } elseif(function_exists('getimagesize')) {
        // open with GD
    } elseif(function_exists('exif_imagetype')) {
       // open with EXIF
    } elseif(function_exists('mime_content_type')) {
       $mimetype = mime_content_type($filename);
    }
    return $mimetype;
}

Programs & Examples On #Iwebbrowser2

C++ cast to derived class

How to choose the right bean scope?

Introduction

@Request/View/Flow/Session/ApplicationScoped

See also:

@CustomScoped/NoneScoped/Dependent

See also:

Flash scope

See also:

Dynamically add script tag with src that may include document.write

How to open the default webbrowser using java

Keras input explanation: input_shape, units, batch_size, dim, etc

Units:

Shapes

The input shape

Relation between shapes and units - The output shape

Weights

Shapes in Keras

Dim

Defining your image in Keras

any tool for java object to object mapping?

Rendering an array.map() in React

how to set auto increment column with sql developer

What's the best practice for primary keys in tables?

CSS endless rotation animation

How do you add an ActionListener onto a JButton in Java

@HostBinding and @HostListener: what do they do and what are they for?

How to refresh materialized view in oracle

"SetPropertiesRule" warning message when starting Tomcat from Eclipse

Declare a Range relative to the Active Cell with VBA

How to dispatch a Redux action with a timeout?

Mean of a column in a data frame, given the column's name

C++ equivalent of java's instanceof

What are metaclasses in Python?

How can I create a carriage return in my C# string

Select all text inside EditText when it gets focus

Find intersection of two nested lists?

How to delete a line from a text file in C#?

How can I make Bootstrap columns all the same height?

Simulation of CONNECT BY PRIOR of Oracle in SQL Server

What is the boundary in multipart/form-data?

What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?

The best way to remove duplicate values from NSMutableArray in Objective-C?

Send SMTP email using System.Net.Mail via Exchange Online (Office 365)

Calling C++ class methods via a function pointer

Child element click event trigger the parent click event

getElementById in React

How to import a bak file into SQL Server Express

Getting the location from an IP address

add allow_url_fopen to my php.ini using .htaccess

Stored procedure - return identity as output parameter or scalar

Does a TCP socket connection have a "keep alive"?

How to return a result from a VBA function

Use .htaccess to redirect HTTP to HTTPs

postgresql return 0 if returned value is null

converting a base 64 string to an image and saving it

Display date/time in user's locale format and time offset

Find the unique values in a column and then sort them

Git checkout - switching back to HEAD

What are Transient and Volatile Modifiers?

Get hours difference between two dates in Moment Js

Refresh a page using PHP

Printing 1 to 1000 without loop or conditionals

Can anyone recommend a simple Java web-app framework?

How to write a FastCGI application in Java

TinyFCGI.java

your_site.conf

Benchmark results

cleanest way to skip a foreach if array is empty

Any way to make a WPF textblock selectable?

How to add chmod permissions to file in Git?

Is it ok to scrape data from Google results?

Splitting String with delimiter

Right align text in android TextView

Escaping ampersand in URL

PHP case-insensitive in_array function

How do I extract data from a DataTable?

Inconsistent Accessibility: Parameter type is less accessible than method

How to trigger the window resize event in JavaScript?

`@Request/View/Flow/Session/ApplicationScoped`

`@CustomScoped/NoneScoped/Dependent`

`TinyFCGI.java`

`your_site.conf`